ALL spoilers will be unmarked ahead. Beware major spoilers.
Repeat! ALL spoilers will be unmarked ahead. Beware major spoilers
Domino City Residents
- Voiced by Yuko Sumitomo
A Toei-exclusive character, Mayumi is a green-haired girl with a crush on Joey. She asked Yugi and his friends for a suitable gift for him and chose a jigsaw puzzle with writing on it, but had it confiscated by Ms. Chono. Tea recovered the gift and encouraged her to talk to him on her own, but Mayumi developed a crush on a second-year student afterward.
- Bit Character: She's only relevant to the jigsaw portion of the episode and disappears after her role's fulfilled.
- Replacement Goldfish: Since Miho is a part of the main cast, she takes Tristan's role in the adaptation of Chapter 7.
- What Does She See in Him?: Yugi and his friends are incredulous that her crush is Joey at first.
- What Happened to the Mouse?: She's never seen after Tea retrieves the gift, with her second crush being discussed by other characters.
- You Gotta Have Blue Hair: Her hair is dark green.
- Voiced by Bin Shimada
A Toei anime-only character, Shotaro is a collector of rare watches to the point of mania. When he steals Tristan's rare D-Shock watch, which was a present for Miho, he incurs the wrath of Dark Yugi.
- Ambiguously Brown: He has fairly dark skin, though his nationality's never specified.
- Basement-Dweller: Shotaro lives in the basement alone, with only his watches for company.
- Body Horror: When he tries to cheat in a Shadow Game, the clock pendulum automatically swipes across his handand instead of blood, he sees gears and sprockets in the gash and his watches bonded with his skin, and lets out a horrible scream as his glasses fall off and reveal clock hands in his eyes.
- Clock King: Shotaro loves watches and collects them obsessively.
- Disproportionate Retribution: He beats a guy unconscious just for bumping into him, while stating that if his watches had gotten damaged the man would be dead.
- Gotta Catch 'Em All: He's obsessed with collecting every rare watch in the entire world.
- It's All Junk: After his Penalty Game, he smashes all of his watches.
- Manchild: While not as bad as Warashibe, he's fairly immature and asks for a do-over during his Shadow Game. He doesn't take losing a second time well.
- Momma's Boy: Shotaro still lives at home with his mother. The ending makes it hard not to pity him, or at least his mother, as she begs him to tell her why he smashed all his watches and pleads that she'll understand.
- Serious Business: To him, watches and watch collecting are such serious business that he's adamant an amateur like Yugi doesn't deserve a D-Shock.
The Kageyama Sisters
- Risa Kageyama voiced by Wakana Yamazaki
Kageyama sister B voiced by Emi Uwagara
Kageyama sister C voiced by Konomi Maeda
Antagonists who only appear for one episode in the Toei anime, Risa Kageyama and her sisters are identical triplets who attend the Black Rose School for Girls. They're well known in the world of Duel Monsters due to the insane lengths they go through to acquire rare cards, and set their sights on Yugi and his friends when they learn he has the rare Violet Hecate card. Risa and her sisters duel with a deck based on the Hecate Sisters, which can merge into the powerful Gorgon, a monster that rivals the Blue-Eyes White Dragon in terms of attack power.
- Bitch in Sheep's Clothing: Risa befriends Yugi at first and dotes on him, but it's all a ruse to steal the Violet Hecate card.
- Canon Immigrant: Sort of. While exclusive to the Toei anime, Risa's name appears on Trueman's list in Yu-Gi-Oh! GX. This makes her one of a few characters exclusive to the Toei series to be mentioned in another anime series.
- Dark Is Evil: They practice witchcraft and tend to quote Macbeth, which is fitting as their deck is based around the Hecate Sisters.
- Even Evil Has Standards: Risa and her sisters will resort to emotional manipulation and blatant thievery, but even they wouldn't tamper with someone's deck. Also, despite actually stealing the Violet Hecate card from Yugi, they don't include it in their deck during the duel, which would've given them an even greater advantage. They only use it when Kaiba gives them permission to do so after he takes over.
- Fangs Are Evil: When showing their villainous side, all of them sport fangs.
- Game Face: When Risa or her sisters are showing their villainous side, their green eyes become glassy and their hair becomes wild, almost as if they're possessed.
- Good Hurts Evil: Risa has an adverse reaction to touching Yugi's Puzzle, prompting her to steal it later on.
- The Hecate Sisters: While the Kageyama sisters don't show any overt signs of this trope beyond their Macbeth quotes, it manifests more clearly in the Hecate Sisters cards. Violet Hecate is the Maiden, Yellow Hecate is the Mother, and Red Hecate is the Crone.
- Honey Trap: Risa pretends to have a crush on Yugi in order to gain his trust before asking if she could have his Violet Hecate card as a token of his affection. The plan fails when Yugi gently declines to hand it over, as he originally got the card from Tea and thought it wouldn't be fair to her. Risa and her sisters decide to break into Yugi's room and steal it a little while later.
- Karma Houdini: They steal the Millennium Puzzle and Yugi's Violet Hecate card and come very close to beating Yugi and Kaiba, but don't really get punished for their actions since the episode ends immediately after they lose the match.
- Near-Villain Victory: They're defeating Yugi before Kaiba steps in, and when he does they bring out their Gorgon, which is even stronger than a Blue-Eyes thanks to the forest terrain. They lose because Kaiba draws a second Blue-Eyes, which overpowers Gorgon.
- No Name Given: Risa is the only sister to actually be named, while the other two are never addressed as single individuals. As a group, it's impossible to tell which of them is Risa.
- Same-Sex Triplets: All three of them are girls.
- Whip It Good: They carry whips with them, which allows them to steal the Millennium Puzzle from Yugi.
- Wicked Witch: They practice witchcraft, and their deck is based on the Hecate Sisters.
- Worf Had the Flu: Yugi almost loses to them partially due to illness.
- Voiced by Nobuo Tobita
A Toei anime-only character, Warashibe Kiwami is a college student with an obsessive crush on Miho and a love for collecting Capsule Monsters. He poisons Miho's friends when she spurns his advances, but is foiled by Yami Yugi in a Capsule Monsters match.
- Dramatic Irony: Warashibe's punishment is being trapped in a level one capsule.
- Expecting Someone Taller: Miho clearly wasn't expecting Warashibe to look so dorky.
- Manchild: It's especially evident when he throws a fit over losing a game and not getting Yugi's help, and instead of a cigarette he sucks on a lollipop.
- Meaningful Name: Warashibe means "child," and he acts like a bratty, spoiled child.
- Murder the Hypotenuse: He poisons Tea, Joey, and Tristan for getting between himself and Miho.
- Not Good with Rejection: Warashibe is less than pleased with Miho saying she doesn't like Capmon or him.
- Out-Gambitted: Yami Yugi tricks Warashibe into destroying four out of five monsters and then uses the last one to destroy all of Warashibe's monsters in one hit.
- Stalker with a Crush: Until the "rescue" scenario, Miho had never met Warashibe in person.
- This Is Unforgivable!: Miho decides to confront Warashibe in person after he poisoned her friends.
- Yandere: Warashibe wants to keep Miho in a huge capsule as if she were a trophy.
Doctor Kekeru Goyu
- Voiced by Banjo Ginga
A Toei anime-only character, Dr. Goyu was a corrupt doctor at the hospital where Serenity was staying. He cares more about playing golf than caring for patients, fired the nurse Miyuki after trying to hit on her, and blackmailed Joey into keeping quiet by threatening Serenity. Dark Yugi played a Shadow Game of golf with him, and his Penalty Game was to see the wraiths of patients that died due to his negligence.
- Doctor Jerk: He cares more about playing golf than caring for patients, tried to hit on the nurse Miyuki, and threatened to remove Shizuka from the hospital when Joey tried to expose him.
- Lazy Bum: He puts much more effort into golfing than work, resulting in many of his patients dying.
- Smug Snake: He's so confident in his golfing skills he doesn't take Yugi seriously at all.
- Voiced by Yuri Amano
A Toei anime-only character, Miyuki is a nurse overseeing Joey's sister Serenity. Joey develops a crush on her, but she's fired from her job by her corrupt mentor, Dr. Goyu. Afterward, Miyuki reveals she was planning on leaving the hospital to begin with and will continue practicing on a remote island with another doctor.
- Florence Nightingale Effect: Joey fell in love with her after she treated his own wounds.
- MayDecember Romance: Her exact age isn't specified, but she's an older woman while Joey's still in high school.
- Race for Your Love: Subverted. Joey races to meet her at the station before she leaves, but finds his roses have all had their petals fall off. Miyuki accepts the rose stems anyway, but says she was planning on leaving to begin with and will continue practicing on a remote island with another doctor. While she says Joey can visit over summer vacation, it's clear that she intends to date the other doctor.
- Voiced by Yumi Touma
A Toei anime-only character, Kaoruko is a spoiled beauty and model who antagonizes Miho at a school beauty contest. She was given a Penalty Game where she saw herself as old and ugly, with snakes wrapping around her wrists.
- Alpha Bitch: She's a spoiled model determined to win the beauty pageant at any cost.
- Berserk Button: Her age. When Miho makes a comment on how the popularity contest is more about the tightness of the contestants' skins, Kaoruko takes it very poorly and seems upset at being reminded she's a couple of years older than Tea and Miho. Miho's satisfied expression makes it clear she knew this would sting.
- Canon Immigrant: Sort of. While exclusive to the Toei anime, Kaoruko's name appears on Trueman's list in Yu-Gi-Oh! GX. This makes her one of a few characters exclusive to the Toei series to be mentioned in another anime series.
- Cheaters Never Prosper: In the popularity contest, she goes out of her way to sabotage Tea and Miho through increasingly desperate means. The most drastic measure involves drugging Miho with chloroform and cutting up her clothes while leaving the girl in an alleyway.
- Christmas Cake: Even though she's still a teenager, Kaoruko is incredibly self-conscious about her age and, for a moment, is legitimately upset at being reminded she's older than Tea and Miho. The thing is, she's only one or two years older than them but is enraged just to be reminded of it.
- Evil Redhead: She has bright red hair, similar to Ms. Chono.
- Girl Posse: She has two unnamed girls who follow her around, spy for her, and carry out her commands.
- Hoist by His Own Petard: What gave her away as the person who drugged Miho was a petal that fell from the rose she wore in her hair. During her Shadow Game with Yami Yugi, he defeats her by picking that exact rose, thus leaving her holding the last flower.Yami Yugi: I said all the flowers you had. I never said just the bouquet.
- Smug Snake: She originally had no desire to participate in the popularity contest until she was convinced she could teach Tea and Miho a lesson about knowing their place.
- The Smurfette Principle: In the Toei anime, she's the only female opponent to receive a Penalty Game besides Ms. Chono.
- Something About a Rose: She wears a rose in her hair, and her Shadow Game is about picking roses.
- Voiced by Daisuke Sakaguchi
A Toei anime-only character, he appears in the virtual pet episode as the true villain. Haiyama's a glasses-wearing kid who acts timid, but bullied Kujirada into submission with a whip and has done this to many other bullies. He treats others as pets, using rewards and punishment to make them do his bidding, and his Penalty Game was an illusion of being eaten by his own digital pet, which he mistreated.
- Bitch in Sheep's Clothing: He pretended to be timid and weak, but is the main villain of the episode.
- Creepy Child: When he reveals his true colors, his hair goes wild and his eyes turn watery and insane.
- The Dog Bites Back: His pet turns on him when he tries to make it fight more.
- Evil All Along: He was the real mastermind, not Kujirada.
- Expy: His timid facade resembles Hanasaki from the manga, who was Adapted Out in the anime.
- Laughing Mad: Cackles insanely when fighting Yami Yugi.
- The Man Behind the Man: Was controlling Kujirada.
- Mind Rape: His penalty game is being 'eaten' by his digital pet, though physically he's fine.
- Nerdy Bully: At first he appeared to be a vulnerable nerd, alongside Kujirada (who appeared to be a standard Bully). But it's later revealed Haiyama had been keeping Kujirada as a pet and whipping him to make him do his bidding. He also tries to make Tristan his new pet. Dark Yugi sets to put an end to his inhumane treatment using a Shadow Game.
- Nightmare Face: Once he's revealed as the true villain, his previously innocent visage is replaced by a sadistic grin reminiscent of The Joker.
- Slavery Is a Special Kind of Evil: Haiyama treats people as pets, and makes them do things and he rewards them with whatever they want/like. For Kujirada's case, his "feed" was money. For Tristan, his was Miho.
- Smug Snake: Despite the threat he poses, he's so confident Yugi's attacks will fail he doesn't think to defend against them, and can do nothing when Yugi's pet evolves and beats him.
- Stalker Without a Crush: Haiyama turns out to be this, having spied on and taken pictures of Kujirada since middle school to slowly bend him to his will.
- Walking Spoiler: While he only appears in one episode, his being the real villain spoils a good deal about him.
- Whip It Good: Haiyama uses a whip to punish his "pets" and to attack Yugi and Tristan.
- Voiced by Nobuyuki Hiyama
Also known as "Tetsuo the Hedgehog," he is a Toei anime-only criminal who was framed by Jiro for breaking out of prison and committing robberies. Together they serve as a Decomposite Character of the Burger World criminal from the manga.
- Always Someone Better: After escaping, he was very angry at learning Jiro pulled off robberies he planned to.
- Voiced by Mahito Ohba
Also known as "Jiro the Yellow Spider," he is a Toei anime-only criminal based on the Burger World criminal from the manga. Jiro is an escaped convict and master of disguise, framing Tetsuo Sasaki for his own crimes. He worked as manager at Burger World at the time Tristan Taylor, Miho Nosaka and Tea Gardner were working there, but was foiled by Dark Yugi.
- Master of Disguise: He disguised himself as Tetsuo to commit robberies, leaving himself in the clear.
Mr. Morita (Coach Morty)
- Voiced by Eiji Takemoto (JP), Unknown (EN)
A teacher at Domino High and the soccer coach in the dub, he only appears in the second-series anime. He tells off Yugi's friends for skipping class, but agrees to let them go once Tea lies that Yugi is sick (in the dub she lies that her cat is sick).
Rebecca Hopkins (レベッカ・ホプキンス; rebekka hopukinsu) (Rebecca Hawkins)
- Voiced by: Kaori Tagami (JP), Kerry Williams (EN), Ana Esther Alborg (European Spanish)
An anime-only character, Rebecca is the granddaughter of the famous Egyptologist, Dr. Arthur Hopkins/Hawkins. She first appears seeking vengeance on the behalf of her grandfather by beating his old friend, Solomon Mutou, and taking his Blue Eyes White Dragon card and returning it to her grandfather. After her grandfather finds her and teaches her a valuable lesson about friendship, she quickly befriends Yugi and Solomon. During Season 4, she returns and becomes a member of Yugi's True Companions and accompanies him on his travels, dueling in Kaiba's tournament in Season 5.
Her first deck concentrates on supporting Shadow Ghoul. Afterwards, she uses a dragon deck mixed with a Fire Princess Gain/Drain strategy. This deck's trump card is Diamond Head Dragon.
- Age Lift: 12 in the original version, 8 in the dub.
- Between My Legs: The shot used for her introduction.
- Bratty Half-Pint: Boy was she ever, she practically demands Solomon just hand over the card as soon as she meets him and refused to listen to reason till her grandfather set her straight.
- Dangerously Short Skirt: Likes wearing one.
- Dark Is Not Evil: Despite acting like a brat, she is far from evil. Yet her Shadow Ghoul Deck not only has Shadow Ghoul, but many other Dark monsters, including Cannon Soldier, Sangan, and Witch of the Black Forest. In Season Five, she adds Darklord Marie to her new deck.
- Decomposite Character: While the fine details differ greatly, she does share a few similarities to Duke/Otogis manga counterpart that are absent in anime version. Like Duke, her primary motivation is avenging a relatives loss against Yugis grandfather in the past. Shes also faced by Yugi himself, rather than Yami.
- Deliberately Cute Child: She acts cute even when she's angry, using it to her advantage at times.
- Eagleland: A type 2, very blunt and demanding, with no cultural respect whatsoever.
- Foreign Cuss Word: She swears a lot in the Japanese anime.
- Genki Girl: Gets excitable a lot during her duel.
- Girlish Pigtails: Loses them after season 1, only to get them back in the KC Grand Prix arc.
- I Let You Win: How her duel with Yugi ends. Yugi forfeits the match when he actually had a card that would've won him the duel, doing so in order to teach her to respect her cards.
- Jerkass: She gets better at the end, though.
- Lack of Empathy: Has No Sympathy for Yugi or his Grandpa, the latter of whom just recently recovered his soul, until the very end. Also no sympathy for her own monsters (at least in Season One), stating that her monsters were useful only to serve as either weapon or tribute fodder.
- Maybe Magic, Maybe Mundane: Her first duel with Yugi is, according to Grandpa, almost identical to the one he and Arthur had, right up to the part where Yugi gave up, and both he and Arthur seem barely surprised it happened that way. While the script seems to suggest this is Because Destiny Says So, it does seem rather weird that it would happen that way.
- Misblamed: In-universe. Rebecca thought Solomon stole the Blue Eyes White Dragon Card from her grandfather, but she didn't get the full story. Averted in Yu-Gi-Oh! Reshef of Destruction, where she did get the full story and confronted Kaiba about it.
- Obfuscating Stupidity: She deliberately lets her monsters be destroyed to pile up her Graveyard and power up her Shadow Ghoul.
- Her monsters Witch Of The Black Forest and Sangan have effect that allow Rebecca to gain hand advantage after they got sent to the Graveyard.
- She also weakens her Millennium Shield by equipping it with a spell card Ring of Magnetism to restrict Yugi's Battle Phase.
- Security Blanket: Carries a teddy bear around the first time she appears, but gets rid of it later.
- Spoiled Brat: She acts entitled to duel Yugi and his grandpa and throws frequent tantrums when things don't go her way.
- Stone Wall: Her monster Millennium Shield has 0 ATK and 3000 DEF, still powerful enough to resist Yugi's Summoned Skull even after got depowered by a spell card.
- What Measure Is a Mook?: She has this attitude towards her cards, deliberately treating them like a Red Shirt Army. This callous attitude would be shown in a much darker tone later with Pandora.
- You Have Outlived Your Usefulness: How she views her monsters in her Shadow Ghoul deck. Yugi calls her out on it.
- Youthful Freckles: She has freckles to emphasize her young age.
- Ascended Extra: Went from a Duelist of the Week in Season 1 to part of the main cast for Season 4 and the first half of Season 5.
- Break the Cutie: When she found out that Yugi's soul was captured by the Orichalcos, she did not take it well.
- Child Prodigy: She's a twelve year old college student.
- Dangerously Short Skirt: Still likes wearing these.
- Dub-Induced Plot Hole: 4Kids lowered her age from twelve to eight in season 1, which became a bit of a problem when she returned in season 4 looking much older. Amusingly, they would later make the same mistake with her Expy, Rei/Blair.
- Meganekko: Note her glasses now.
- Odd Friendship: With Tea, who is also her rival in love, but they still act like an older/younger sister pair.
- Playful Hacker: She hacks Kaiba Corp security system to help Yugi and Kaiba when they storm the Kaiba Corp building after Doma takes over the place. Then she teases Kaiba by saying that the security system is nothing special, and that he should hire her to write a better system.
- Precocious Crush: She has one on Yugi, which is a constant source of irritation for Tea. It's more prevalent in the dub, where she was eight in her first appearance instead of 12.
- Self-Proclaimed Love Interest: She claims that Yugi is her boyfriend.
- She Is All Grown Up: Well, not really, but she likes to act like this, including ditching her teddy.
- Ship Tease: She has a crush on Yugi. She is also the only character in the entire series to kiss anyone, giving Yugi a goodbye kiss before leaving the second time.
- Plus, she's devastated when she hears of Yugi's soul being captured and determined to avenge him when Valon shows up, a huge step up from Tea just being shocked in a normal way.
- Smart People Wear Glasses: In fact, she starts wearing them after being granted early access to college.
- Took a Level in Badass: While she was good in her first duel too, her strategy essentially worked out to filling her Graveyard with tribute-fodder monsters to power up Shadow Ghoul. In Seasons 4 and 5, she's evolved her dueling strategy to keep up with the increasingly complex real-life game, resulting in a deck that combines Burn, Recovery, Tokens, and Dragons into one surprisingly synergized playstyle. One of her favourite strategies is to send Darklord Marie to the Graveyard, enabling her to regain 200 Life Points each turn, and summon Fire Princess, which inflicts damage on her opponent each time she increases her Life Points.
- Took a Level in Kindness: She's comfortable hanging with Yugi's friends and has mellowed out quite a bit from her first appearance.
- Vitriolic Best Buds: With Tea she develops a sisterly relationship, which includes all the support and bickering such a relationship implies.
- What the Hell, Hero?: Gives one to Yami Yugi in the Doma filler arc over him losing Yugi's soul. Serves as a Foil to Tea, as while Tea is sad but tries to support Yami Yugi (possibly due to realising Yami Yugi is already beating himself up over it), Rebecca remains angry at him and there's no real reconciliation between the two.
- Zettai Ryouiki: Wears white thigh highs; a Grade A.
- Voiced by: Hozumi Gouda (JP), Greg Abbey (EN)
A famous Hollywood actor, Jean-Claude Magnum has his sights set on marrying Mai and won't take no for an answer. Magnum duels Mai under the condition that if he wins, he marries her and takes her spot in the Battle City finals. He uses a ninja-themed deck that focuses on swarming the field, and his trump card is Ninja Master Shogun. Magnum also appeared in Yu-Gi-Oh! The Sacred Cards and Yu-Gi-Oh! Reshef of Destruction, set on marrying Mai once more.
- Adaptational Badass: In the game Yu-Gi-Oh! Reshef of Destruction, he has a Hungry Burger in his deck, which, being the Divine Attribute, cannot be beaten via the Elemental RockPaperScissors method common in the game. This makes him a very tough opponent.
- Broken Pedestal: Joey was a fan of his movies until he proved to be a big phony.
- Eagleland: Type 2; he's a Hollywood star who's completely full of himself and won't take no for an answer.
- Entitled Bastard: He tries to kidnap Mai with the intent of forcing her to marry him after losing the duel.
- Filler Villain: He only appears for a single episode, right before the Battle City Finals.
- Highly Visible Ninja: The theme of both his deck and, it seems, most of his movies.
- Hopeless Suitor: He's dead-set on marrying Mai, but she's completely uninterested.
- Miles Gloriosus: He'd like folks to believe he's just as tough as his on-set personality; not even close.
- Sore Loser: He tries to kidnap Mai after she beats him in a duel.
- Stalker with a Crush: He's been following Mai around for years trying to propose.
- Weak, but Skilled: None of his monsters have high attack points, but their effects are devastating.
- Voiced by: Rie Tanaka (JP), Caren Manuel (EN)
An Anime Chinese Girl renowned in the world as an idol singer and martial artist. Vivian is a fan of Yugi, but takes it to disturbing levels when she kidnaps and injures Grandpa to force a duel between them on the condition that Yugi become her boyfriend and slave if he loses. She also has a crush on Kaiba.
Vivian uses a deck with cards based on Chinese mythology and martial arts. Her trump card is Dragon Lady.
- Action Girl: Is quite proficient in martial arts. She's a skilled duelist as well, enough to be considered China's best.
- Anime Chinese Girl: Quite clearly.
- Atop a Mountain of Corpses: Otogi imagines her this way in her duel with Rebecca, brooding over fallen and defeated foes with her duel disk in hand.
- Battle Couple: She imagines herself, Yugi, and/or Kaiba as this.
- Bitch in Sheep's Clothing: Not as evil as others, but still meaner than she looks.
- Break the Haughty: Both of her duels result in this.
- Evil Counterpart: While not really evil, she serves this function to Rebecca. She's basically her minus the IQ and the EQ.
- Fangirl: An apparent Deconstruction of one, as she is seen as annoying in-story because of her rabid fangirlism and refusing to take no for an answer.
- Femme Fatale: Plays up this angle in her duels, which supposedly led to a lot of her success in her home country.
- Genki Girl: Is over-the-top in her displays of emotion and hyperactive to the extreme.
- Harmless Villain: Despite her antics, she never manages to do any successful damage to the main characters, being viewed as more of an annoyance than a threat.
- Hate Sink: The only other antagonist in the KC Grand Prix arc besides the main ones.
- Jerkass: She breaks an old man's back and uses him as leverage to duel Yugi.
- Joke Character: Has no plot relevance aside from dueling Rebecca and Yugi and engaging in comedic fangirl antics.
- Loony Fan: For Yugi and Kaiba.
- Lovely Angels: With Mai, at the end of the series.
- Never My Fault: Is first met by accidentally bumping into Rebecca and rather than apologize, she blames Rebecca 'cause "she was in the way."
- New Job as the Plot Demands: The dub has her be a model turned actress turned kung-fu champion turned duelist.
- Noblewoman's Laugh: Which emphasizes her haughty behavior.
- Odango Hair: Her hairstyle.
- Pressure Point: Knows how to exploit it, as poor Grandpa found out.
- Psychopathic Woman Child: Acts crazy and is really immature despite being in her late teens at most.
- Qipao: She wears a very skimpy one.
- The Rival: Tries to be one to Rebecca. It does not go well for her.
- Small Name, Big Ego: Carries an air of superiority to everyone else she interacts with even when the reality is the reverse.
- Stalker with a Crush: Takes to stalking Yugi following her loss to Rebecca. Allegedly she wants to make him her "love slave."
- Straw Fan: Gushes over the male characters and is hostile toward female ones, like many a real-life fangirl, though in this case the female characters can be just as hostile to her right back.
- Supreme Chef: Prepared a whole feast at a Chinese Restaurant that Yugi's friends spent the entire Yugi vs Vivian duel eating.
- Take That!: Apparently one on fangirls, showing how the characters in-universe would really react to such people, rather than falling in love with them like in fanfics.
Kaiba Corporation and Death-T
- Voiced by Chikao Ohtsuka
A United Kingdom Game Master hired by Seto Kaiba in the Toei anime. He loves to collect dolls, and bases his dueling style around them. Sheldon's most treasured doll is named Fiona. He also uses realistic, life-sized puppets to impersonate people and lure them to his games.
- Companion Cube: His most treasured companion is a doll named Fiona.
- Creepy Doll: His play style and hobby is based around realistic dolls.
- High-Class Glass: He wears a monocle.
- Loners Are Freaks: It's unknown if Sheldon has any friends of any age. Based on his opening scene, though, he may be alone, which is why he had a "tea party" set up for him and his mannequins.
- The Real Remington Steele: In episode 8, he impersonates the school nurse using a life-size puppet. In episode 11, the nurse appears for real when treating Yugi's friends.
- This Is Unforgivable!: Sheldon ups his game when Fiona, one of his most treasured dolls, gets singed.
- Voice Changeling: He can imitate the (female) school nurse flawlessly.
- Voiced by Ryo Horikawa
An insanely lucky game show champion who was hired by Seto Kaiba in the Toei anime as his second Game Master. Ryuichi acts personable in public, but in private he's a superstitious, cocky jerk who believes his luck makes his invincible. Alongside Aileen Rao, he dueled against Joey and Miho at Death-T.
- Arrogant Kung-Fu Guy: He believes his luck makes him invincible, and looks down on anyone beneath him.
- Ax-Crazy: He slips into this when trying to bring out Dark Yugi, wondering if Yugi's 'other face' is literal so he'll grind it off if need be.
- Born Lucky: His entire shtick is being obscenely lucky, until he runs into Yugi.
- Brought Down to Normal: After he loses to Yugi, his luck goes with it.
- Voiced by Miina Tominaga
A Canadian-Indian Game Master hired by Seto Kaiba in the Toei anime, Aileen is also an idol, dancer, and actress. She antagonized Yugi and Tea at first, then dueled against Joey and Miho at Death-T alongside Ryuichi Fuwa. Aileen prides herself on reading opponent's strategies and tricking them in games, and also has the power to hypnotize people.
- Batman Gambit: She held Tea hostage to make Yugi easier to read, also using her words to unnerve him.
- Bitch in Sheep's Clothing: She befriends Yugi and Tea at first before revealing her identity as a Game Master and putting Tea in danger.
- But Not Too Foreign: Aileen is Canadian-Indian but she speaks perfect Japanese with no Gratuitous English.
- Clark Kenting: Aileen is a world-famous model, but when she comes into the game store wearing sunglasses nobody recognizes her until she takes them off.
- Compelling Voice: She uses a hypnotic suggestion to freeze Tea solid, and it's revealed that she also hypnotized anyone who lost to her to make them think they lost whatever's important to them.
- Dark Action Girl: At Death-T she takes Joey on in hand-to-hand combat and wins, until the power of his friendship gives him a second wind.
- Defeating the Undefeatable: Much like Kaiba, Aileen never lost a game before she ran into Yugi.
- Evil Counterpart: To Tea and Dark Yugi. Like Tea, she's a dancer and achieved her dream of being an idol, and like Yami Yugi, she prefers reading her opponents and psyching them out over luck-based games.
- First-Name Basis: Unlike most characters, she's on a first-name basis with Seto Kaiba.
- Graceful Loser: She's not too upset at losing to Yugi.
- HeelFace Revolving Door: She seems to turn good after Yugi defeats her, but come Death-T she's working for Kaiba again and is even worse than before.
- Lady of War: She never raises her voice, is good with strategy and tactics, and comes very close to defeating Yugi before she loses. Death-T reveals she's good at physical fights, too.
- Near-Villain Victory: She handily wins her Raijinhai game with Yami Yugi at first, and at Death-T she does defeat Joey until he restores his energy points through friendship and wins.
- Panthera Awesome: Aileen has a pet tiger, which she threatens Tea with.
- Villainous Crush: By the end of her debut she develops a crush on Yugi, hoping that the next time they meet it'll be in a game of love.
- Younger Than They Look: She looks to be anywhere from her 20s to 30s but is actually only 19.
Red, Black, and Blue
- Red voiced by Hisao Egawa
Black voiced by Masaharu Sato
Blue voiced by Hiromi Nishikawa
Color-coded hired guns who took part in the Stardust Shootout section of Death-T. Unlike in the manga, where Joey and Tristan defeat the shooters, in the Toei anime they wound Joey and Tristan. Miho Nosaka defeats them by firing in a panic.
- Adaptational Badass: In the manga Joey and Tristan defeated them, while here they wound them both and lose because of Miho panicking.
- Color-Coded for Your Convenience: All of them are named after colors.
- Confusion Fu: They're defeated this way because of Miho's panicked shots.
- Dark Action Girl: Blue wounds Joey with her laser pistol.
- The Smurfette Principle: Blue is the only female member of the group; in the manga all three commandos were men.
Noah Kaiba (海馬 乃亜; kaiba noa)
Gozaburo Kaiba's biological son and Seto and Mokuba's step-brother, though they never met him. Initially intended to be Gozaburo's heir, he was in a car accident and died. What was left of his mind was digitally recreated as a computer program, and his father turned his attention to Seto as his new heir. Noah didn't take this well and kidnaps Kaiba and his friends to prove his superiority.
He uses a deck that emulates the stages of Earth's creation, then switches to a Spirit deck. His trump cards are Shinato's Ark, Shinato - King of a Higher Plane, and Hino-Kagu-Tsuchi.
- A God Am I: When he explains the rest of his backstory to Kaiba, claiming that his massive capacity and compendium of knowledge makes him akin to a superhuman.
- Absurdly High-Stakes Game: Lose a duel in his world, and you'll be trapped there forever while the winner escapes in your body.
- Arc Villain: The Heavy of the Virtual Nightmare Arc.
- Bad Boss: Like Dartz afterwards, he tends to berate the Big 5 for their failures, and sends them to the far reaches of cyberspace after they're defeated the second time.
- Because You Were Nice to Me: Mokuba softens up to Noah quite a lot after learning he was just another victim of Gozaburo like he and Seto were. Though it takes Noah a little while to come around, he eventually repays Mokuba's kindness by saving everyone from Gozaburo.
- Brain Uploading: After his car crash accident, his father transferred his mind into the Virtual World. The 4Kids dub implies that he cheats death again by sending his mind into a backup file.
- Cain and Abel: The Cain to Kaiba's Abel.
- Cheaters Never Prosper: His cheating lets him beat Kaiba, but brings the wrath of Yugi and Yami down on his head.
- Composite Character: While Noah's design, superior attitude, and sense of entitlement is like Death-T era Kaiba, his smugness and spoiled brat behavior is like manga Mokuba. The Because You Were Nice to Me nature of his HeelFace Turn even mirrors manga Mokuba's.
- The Computer Is a Cheating Bastard: Literally, since he's the one controlling the Virtual World. He not only uses emotional manipulation against Kaiba and Yugi, but his deck master(s) is quite overpowered with effects that give him an unfair advantage.
- Conscience Makes You Go Back: He rescues the entire main cast from being trapped in the virtual world, complete with What Have I Done.
- Damage-Sponge Boss: The main difficulty in beating him is getting past his defenses: he not only gets to summon any previously destroyed monster from Shinato's Ark to heal himself, but at the end of his duel with Kaiba and continuing into his duel with Yugi, he has thousands upon thousands of Life Points and uses cards and effects to give him rapid LP recovery, to the point direct attacks don't even faze him. It says something that it took a direct attack from all three of Seto's Blue-Eyes White Dragons to finally put him down.
- Death Equals Redemption: He sacrifices himself to stall Gozaburo so the heroes can escape.
- Dick Dastardly Stops to Cheat: Shinato's Ark allows him to increase his Life Points by a huge amount, so using Mokuba as a shield was not necessary.
- Disc-One Final Boss: It's not until his defeat that we know Gozaburo is even there.
- The Dragon: To Gozaburo. He's aware of it in the dub, not so much in the sub.
- Easily Forgiven: Mokuba in particular really seems take to this towards Noah, in spite of the fact that he essentially Mind Raped him, used him as a meat shield, turned him into stone, and then when he genuinely tried acting nice to him the first time was rewarded by having his body be briefly stolen. Although Mokuba knew that Noah was being manipulated by Gozaburo, who treated everyone terribly, so Mokuba likely sympathized with him for that reason.
- Enfante Terrible: He's actually around Kaiba's age, but is permanently stuck in childhood.
- Even Evil Has Standards: He stops Ooka/Johnson from cheating during his duel with Jounouchui, as victory through dirty playing won't prove their superiority. Then completely subverted when he unnecessarily uses Mokuba as a human shield to stop Seto from attacking him.
- Evil Counterpart: Kaiba's first one in the anime. See Foil below, for how.
- Evil Is Petty: He turns Yugi's friends into stone for annoying him with their cheering.
- Expy: To the early manga/Toei Kaiba, to the point of having green hair.
- Faux Affably Evil: Moreso in the Japanese version.
- Filler Villain: The first notable one in the series.
- Final Boss: Subverted. It looks like defeating him is the last thing that Kaiba and Yugi have to do before they can break out from the virtual world. In reality he's only The Dragon to his father, who then steps in as the True Final Boss, who must be beaten in order for them to escape.
- Foil: Kaiba's a Self-Made Man and Self-Made Orphan who went from Rags to Riches. Noah's a Spoiled Brat and "Well Done, Son!" Guy who's lost everything. The comparison is pretty obvious.
- Gambit Roulette: The way his duel vs. Kaiba and subsequently Yugi carries out in how he improbably transitions through his deck's themes, including the (then) harder to play spirit monsters.
- Giggling Villain: More so in the sub, but he really loses it when his plans have been foiled and Gozaburo takes over.
- Grand Theft Me: He planned to do this to Kaiba; he does do it to Mokuba for a while.
- HeelFace Turn: Mokuba convinces him to do one at the end of the Virtual World arc.
- Hypocrite: Calls out the Big Five when they try to cheat or take bodies without having won a duel... then does it himself.
- I Am Not Left-Handed: For all the hypocritical cheating he does, when he actually gets to his Spirit monsters versus Yugi, he's a legitimately scary opponent. Spirit monsters (usually) return to the owner's hand on the turn they're summoned or flipped, and Noah uses Spring of Rebirth to make sure all monsters that go back to his hand from the field give him 500 Life Points; it doesn't help that most of his Spirit monsters have some nasty abilities. This equates to Noah becoming a constantly-regenerating wall of Life Points with a legion of monsters that do their business and then flee before they can be attacked. Yugi had to get a direct attack with all three of Seto's Blue Eyes White Dragons at once to finally defeat him.
- Idiot Ball/Villain Ball: Grabs it in the last turns of his duel with Yugi. He had over 9,000 Life Points at the time. Had he just taken the direct attack from Dark Magician, which isn't even a third of his Life Points, on his next turn he could have attacked it to win the duel. Instead he switches it to defense to protect himself from said attack, thus on his next turn he has to attack the Magician of Black Chaos to inflict damage, and the slight ATK difference between the two monsters results in Yugi hanging on with 100 Life Points.
- It's All About Me: Even more so than Kaiba. Just for fun sometime, count the number of times Noah gets mad at someone for making him look bad.
- Jerkass: He's inherited it from Gozaburo, and unlike Seto, it's genuine.
- Kick the Dog: He did not need to cheat in order to win his Duel against Kaiba, but did so anyway out of petty sadism. Then he turned both Kaiba and Mokuba into stone just for the fun of it right as they were reaching out towards each other! And then when he gets tired of Yugi's friends calling him out on his shit, he starts turning them to stone one by one to torment Yugi.
- Large Ham: He's very hammy at times, especially when he's winning.
- Light Is Not Good: Temporarily fuses with Shinato, King of a Higher Plane, an angel like monster. And his deck reflects the biblical story of Noah.
- Meaningful Name: His deckmaster is the Ritual Spell Shinato's Ark, and the first phase of his deck's strategy emulates the Great Flood.
- Mythology Gag: Noah's design is nearly identical to Kaiba's design in the manga's Death-T and the first anime. His green hair is also a callback to Kaiba's Adaptation Dye-Job in Toei's version of the anime.
- Near-Villain Victory: He manages to take over Mokuba's body, launches a missile to kill everyone left in the virtual world, and is about to leave, but Mokuba's positive influence on him makes him change his mind at the last second.
- New Powers as the Plot Demands: Shinato's Ark and Shinato both manifest new abilities any time Noah is losing. You begin to suspect that he's changing the rules as they go along.
- Not So Different: From Kaiba.
- Older Than They Look: Noah's actually in his late teens or early twenties, but is stuck as a child mentally and physically.
- Orcus on His Throne: Aside from when he stops Ooka/Johnson from cheating, Noah is content to sit back in his control chair watching the protagonists run around.
- Our Angels Are Different: Noah's deck master Shinato is a six-winged angel◊ with regal robes and a halo, and its Japanese name is Shinato, King of Heaven. Noah merges with Shinato for a period of time, his face superimposing itself over its.
- Pet the Dog: With Mokuba, eventually.
- Psychopathic Man Child: He never grew up physically or mentally, so he's quite spoiled and prone to tantrums when things don't go his way.
- Redemption Equals Death: After he finally regains his empathy with Mokuba's help, he performs a Heroic Sacrifice to bind Gozaburo in the virtual world as it is destroyed in order to save everyone.
- The Resenter: Towards Seto, whose body and life he wants.
- Screw the Rules, I Make Them!: Noah is essentially the ruler of the Virtual World, and enforces a strict policy of no-cheating on the Big Five, intervening when Johnson doesn't play fairly against Joey, and preventing them from stealing bodies unless they have fairly won a duel. When it's his turn to duel, though, he cheats like crazy despite being perfectly capable of winning fairly, and after losing, bodyjacks Mokuba anyway to try and escape into the real world.
- Slasher Smile: Displays one during his duels with Kaiba and Yugi.
- Smug Snake: Good god is he ever. Noah may not be the morally worst villain in the series, but he is a serious contender for the most arrogant, constantly boasting about how superior he is in his duels against Kaiba and Yugi. At various points, Kaiba, Yugi, and Téa point out that while he may have an impressive amount of advanced knowledge, his mental age is still that of an immature child, and the way he throws a tantrum anytime someone talks back to him only proves them right. Even more prevalent in the sub, where he calls Yugi's friends plebeians.
- Sore Loser: He tries to possess Yugi after he loses. Too bad he's already occupied.
- Spoiled Brat: The source of his attitude. Kaiba and Yami both point this out.
- Surveillance as the Plot Demands: Justified, as Noah maintains and runs the virtual reality program the heroes are trapped in.
- The Unfavorite: Believes he is this. In reality, Gozaburo's too much of an ass to have a favorite.
- Underestimating Badassery: As a Smug Snake, he completely brags about being a superior duelist during his duel against Yami Yugi...that is until the spirit of the Millennium Puzzle manages to turn things around with Kaiba's ace and ultimate monsters no less.
- Unwitting Pawn: He realizes too late that Gozaburo was just using him.
- Villain Ball: His cheating against Kaiba was completely unnecessary, as his Deck Master's ability to increase his life points could have been activated anytime he felt like it.
- Villainous Breakdown: Upon realizing that Gozaburo doesn't love him and possibly never did.
- Virtual Ghost: Like the Big 5.
- Voices Are Mental: He somehow keeps his own voice after he takes over Mokuba's body.
- "Well Done, Son!" Guy: He wanted to make Gozaburo proud of him, not realizing he could never make him happy.
- You Gotta Have Blue Hair: He has mint green hair, similar to Toei Kaiba's lime-green hair.
Mimic of Doom
- Voiced by: Tony Hirota (JP), Wayne Grayson (EN)
A Player Killer who is an obese shapeshifter that impersonates Seto Kaiba during the anime's Duelist Kingdom. He replaces the manga's Ventriloquist of the Dead.
Like the Ventriloquist of the dead from the manga, he uses a deck of Kaiba's stolen cards. In the English dub of the anime, he's apparently Kaiba's evil half brought back from the Shadow Realm. He reveals this by transforming from an evil-looking Kaiba to a toadlike clown. In Yu-Gi-Oh! Reshef of Destruction he appears alongside the ventriloquist, and impersonates Yami Yugi as well.
- Ambiguously Human: Either this guy is a very, very convincing Master of Disguise or a shapeshifter. He even seems able to change his body mass. In any case, his true form is a hideously ugly and obese Monster Clown that only looks human in the loosest terms.
- Asshole Victim: Steals the cards of a supposedly dead man and then makes a mockery out of him by impersonating him... no one particularly cares when Dark Yugi sends him off to hell with a Mind Crush.
- Canon Foreigner: Never appears in the manga, but shares the same role with a character from the manga in the anime.
- Dead Person Impersonation: The Mimic of Doom pretends to be Kaiba after supposedly committing suicide using his unexplained shapeshifting powers.
- Diabolus ex Machina: While the dub's explanation is regarded as somewhat lame, it's actually more than the original version had; there seems to be no explanation at all where this guy came from.
- Everyone Calls Him "Barkeep": Much like Panik, he has no name other than "Imitator of Death" or "Mimic of Doom". Or "Ghost Kaiba".
- Fat Bastard: In his true form, something not easy to disguise, suggesting he doesn't do so by mundane methods.
- The Heartless: The dub plays him out as Kaiba's inner evil that was expelled by Yugi's Penalty Game.
- Player Killing: One of several meant to take out the gamers on Duelist Kingdom. When introduced, he's trying to player kill Yugi.
- Kick the Son of a Bitch: Dark Yugi sends him off to hell with a Mind Crush upon his defeat. No one cares.
- Maybe Magic, Maybe Mundane: It's never truly revealed just how he disguises himself, whether it's an illusion, a conventional disguise, outright sorcery, or a combination of them, though Reshef of Destruction says it's a disguise.
- Names to Run Away from Really Fast: The mimic... of doom.
- Shapeshifting: He switches from Kaiba's form to his own in seconds, and a scene cut from the dub had him impersonate Pegasus on the drop of a hat. Yu-Gi-Oh! Reshef of Destruction makes it clearer that he's using complex disguises.
- Slasher Smile: But not as creepy as his manga counterpart's puppet.
- Smug Snake: He's a lot more competent when the characters believe him to be Kaiba. Once the ruse is discovered, he's just as smug, but lacks the skill to back up his threats.
- Uncanny Valley: Invoked. His appearance when posing as Kaiba is just off, especially when he gives a wide smile that resembles the Kaiba puppet more than anything else.
- Ancient Conspiracy: Plays with this trope. While they own the richest, most secretive and most powerful company in the world and own a piece of every company on Earth, as well as having some measure of influence on the governments of countless nations, all of the members are fairly recent recruits, and there are only a handful of them. The sole exception is Dartz, who is really 10,000 years old, is the former King of Atlantis, was present when the Pharaoh battled Bakura and Zorc in Ancient Egypt, and has been spending his immortal lifespan battling millions of people individually and stealing their souls throughout the ages, with the ultimate aim of bringing about The End of the World as We Know It.
- Corporate Conspiracy: Paradius owns the richest and most powerful company in the world, along with every other company in the world. It's all a front for their Cult devoted to a soul-devouring god.
- Cult: Half corporation, half cult, in that its corporate side is merely a front and financial supplier to its members' worship of the destruction of (to their eyes) a world filled with irredeemable evil.
- Mega-Corp: Paradius/Doma possesses shares in every company on the planet and holds sway over world governments in addition to being a front for a Cult and its Ancient Conspiracy.
- Oddly Small Organization: Doma apparently consists at the beginning of the season of Dartz, Rafael, Amelda/Alister, Varon/Valon, Grimo/Grerimo and, at one point, Mai, and no-one else. Haga/Weevil and Ryuzaki/Rex were briefly members, but they didn't last long. And its members lose their souls one at a time over the course of the season.
Dartz (ダーツ; daatsu)
- Voiced by: Yuu Emaou (JP), Wayne Grayson (EN)
Dartz is the former King of Atlantis and the head of the organization Paradius. His goal is to resurrect the Leviathan using the soul of Pharaoh Atem, and millions of others he has gathered over his immortal lifetime.
10,000 years ago the mysterious substance called the Orichalcos rained down from the skies and allowed the city to make incredible technological advances, but also played on the darkness within their hearts. The people were turned into monsters and Dartz was brainwashed into believing all humanity was evil, and must be destroyed by being fed to the Great Leviathan.
He uses an Orichalcos deck.
- Absurdly High-Stakes Game: Lose a duel after Orichalcos has been played, and you lose your soul. Lose the final duel against Dartz, and the Leviathan returns and ends the world.
- Animal Motifs: Snakes. His temple is decorated prominently with snake heads, his ace monster is Divine Serpent Geh, and the Leviathan is a gigantic snake-like dragon.
- Arc Villain: Of the Waking the Dragons arc.
- As Long as There is Evil: Dartz claims The Leviathan was born from humanity's hatred, so as long as humanity exists, so shall the Beast. However, the Pharaoh says it was created by the Orichalchos.
- Bad Boss: Usually limited to insulting his subordinates for their supposed incompetence and stupidity; however, he clearly has no problem feeding them to the Leviathan if they lose their duels and in fact planned to do so all along. But what really gives him this trope is how he recruited them in the first place- secretly sabotaging their lives, even killing their families, in order to make them hate the world as much as he does.
- Big Bad: Of Season 4, with the Orichalcos as the Bigger Bad.
- Bishōnen: Eternally stuck in his late twenties, and with long turquoise hair.
- Brainwashed and Crazy: Himself, and all of his minions, are controlled or influenced by the Orichalcos.
- Breaking Speech: Nearly forced Yami to surrender, that's an accomplishment by itself.
- The Chessmaster: Has had 10 000 years to make his plan.
- Claimed by the Supernatural: Dartz was marked by the Leviathan in Atlantis, signified by one eye changing from gold to green. (By the show he's had it for so long most would be likely to take as a Mark of the Supernatural instead - which his natural gold eye actually is.)
- Corrupt Corporate Executive: He's the president of Paradius Inc., a company that has bought shares in every major company in the world and has the funds to legally take control of those companies whenever he wants, as he demonstrates with Kaiba Corp. It's very telling that Kaiba nearly shits himself when he realizes his foe's occupation.
- Dark Messiah: Portrays himself as a saviour to his followers.
- Deadpan Snarker: Particularly in the dub.(*after Kaiba loses his soul*) "Orichalcos, one; Seto Kaiba, zip. Pharaoh, it looks like you're the soul survivor."
- Death Equals Redemption: Is cured of the influence of the Orichalcos upon his defeat and is promptly reunited with the spirits of his loved ones, whom he goes off with presumably into the afterlife.
- Determinator: He's waited 10,000 years for one card game with the Nameless Pharaoh.
- Easily Forgiven: Justified as he was Brainwashed and Crazy. Plus, he dies.
- Evil Has a Bad Sense of Humor: In the dub, he makes a lot of cracks that are in really bad taste.
- Exact Words: Dartz's primary half-truth to use against the Pharaoh is that monsters were unleashed on the world by an "evil king", and because of Laser-Guided Amnesia, DOMA and even the Pharaoh himself are led to believe that he was the king in question, as they know no one else who it could be. It's simultaneous relief and a "Duh!" moment for the Pharaoh when Dartz reveals himself as the King of Atlantis.
- Faux Affably Evil: Dub Dartz (almost) always has a gentlemanly air of aristocratic faux politeness and when he drops it, and even when he doesn't, you can just taste his hate and contempt.
- Filler Villain: The second major one.
- Final Boss: Of the DOMA arc.
- Four Is Death: His henchmen.
- Gambit Roulette: Even with the constant revisions of his plans, his own soul proved to be enough to revive the Leviathan, when Yugi manages to beat him.
- God Guise: In the 4kids dub, his first onscreen action is to open telepathic communication with the Pharaoh claiming to be the spirits of the Egyptian god cards. He then walks him through the first few steps of the memory restoration ritual because it will leave the cards open to the spell he's prepared to drain their power. In the original version, the timing is a coincidence.
- Humans Are the Real Monsters: Brainwashed into believing this.
- Invincible Villain: Dartz possesses magic more ancient and powerful than the Egyptian Gods on which the series' mythology is based, is powerful enough to duel the Pharaoh and Kaiba to a standstill and defeat the latter, one of his henchmen defeats Invincible Hero Yugi, and any progress the heroes make against him is negated by it being inconsequential or aiding his plan in some way. It takes six episodes to defeat him in a duel, and his final monster has infinite attack points and is only beaten by going beyond infinity—and when he loses he summons the soul-eating Leviathan anyway, needing an additional two episodes for the dust to finally settle.
- Kick the Dog: Reveals he's behind his minions' Freudian Excuse by instigating each disaster in their lives.
- Knight Templar: He views humans as evil, so he wants to kill them all.
- Manipulative Bastard: With a bit of magic on his side for good measure. So good he nearly talked the Pharaoh into surrendering his soul. Bought out Kaiba Corp purely to goad Kaiba into dueling him. His M.O. for recruiting his henchmen: Raphael's parents were killed by a storm he conjured; Alisters' brother and mom by tanks he sent in posing as Gozoburo Kaiba; and Valon was manipulated into a life of crime either by burning down his orphanage or framing him for his first crime, depending on sub or dub. Mai was preyed on after being traumatized by her Shadow Duel with Marik. All were then given the Orichalcos to play on their inner darkness.
- More Than Mind Control: He uses it to control his subordinates. He himself is a victim of this by the Orichalcos.
- He also nearly gets the Pharaoh to surrender with a combination of Break Them by Talking and straight mind control.
- Near-Villain Victory: His arc ends with the Pharaoh having to bend all the rules of the game to win—though this is in a large part because Dartz's own deck is completely broken and uses illegal cards.
- Outside-Context Problem: The Orichalcos is twice as old (read: at least 10,000 years total) as the Millennium Items, and for roughly three-quarters of the arc, all the main cast and even the side cast know about it is what Dartz and his minions demonstrate. Even Black Magician Girl, the one who gives the gang the Legendary Dragons to fight back with, appeared sketchy on the subject. Needless to say the entire arc is an uphill battle.
- Really 700 Years Old: Though physically in his twenties, or maybe early thirties (we're told he took the throne at 21), he is actually over 10,000, kept alive by the Orichalcos, thus is the oldest character in the second anime.
- Restart the World: His main goal.
- Screw the Rules, I Have Money!: Dartz and his company have so much money, connections and influence that he can effectively control governments, making attempts to call the authorities against him useless. At best, they won't be allowed to do anything to him. At worst, they will be on his side.
- Spanner in the Works: At the start of Season 4, Yugi and the Pharaoh head to the Museum to see the Pharaoh's Tablet now that they have the Egyptian God Cards. Cue Dartz sapping the power of the cards, sealing the Tablet in ice, and unleashing his monsters on the world. The gang would've done the final story arc a lot sooner and possibly even without Dark Bakura's meddling if not for Dartz's opportunism.
- Superpower Lottery: Has the most broken dueling deck of any character in the regular series, period. His advanced forms of the Orichalcos grant him 500 Life Points each turn for every monster he controls, he can tribute monsters to negate attacks and destroy the attacker, and grant his monsters immunity to opposing magic and trap effects. And this is on top of the base effects of extra monster slots, +500 ATK for your monsters, and immunity to removal. Orichalcos aside, his own monsters make him nearly invincible — starting with an infinitely-resurrecting monster that protects his Kyuorta that negates all battle damage he takes, then moving up to a colossal Shunoros which receives ATK equal to the damage his Kyuorta has negated, which is accompanied by two monsters whose ATK and DEF are constantly stronger than whatever they're battling. When that gets defeated, he busts out his ultimate trump card — a monster with infinite ATK points. On top of that, this same monster allows him to keep playing even with zero lifepoints, so he can only lose if the monster is destroyed. Kaiba and Yami Yugi are on the defensive almost the entire duel, and Yami Yugi only endures and wins via several consecutive good draws.
- Time Abyss: He's 10,000 years old.
- Übermensch: He lives by his own rules, baby.
- Utopia Justifies the Means: His goal.
- Well-Intentioned Extremist: As a complete contrast to Dark Bakura and Dark Marik, his goal is to make the world a better place by wiping out all evil humans and sparing the pure of heart. However, he thinks that about 99.9% of humanity qualifies for evil, so that's a lot of people that need to die.
- Xanatos Gambit: Even if his henchmen lose their duels, he still gets their souls, which feeds the Leviathan. The same goes for him, though that turned out a little differently.
- You Gotta Have Blue Hair: He has turquoise hair.
One of Dartz's henchmen, he lived a life of luxury until a shipwreck killed his family and left him stranded on a deserted island with only his deck for company. As a result, he's very attached to his cards and refuses to let them be destroyed.
He uses a Guardian deck, along with many cards that protect his monsters from going to the graveyard, and is so far the only one of Dartz's henchmen whose cards are mostly real. His trump cards are Guardian Eatos and Guardian Dreadscythe.
- Always Someone Better: To Rebecca, who mentions that after she became the US champion, there were rumors that she only won because Rafael doesn't compete in championships. Arguably to Dark Yugi himself, given that Rafael beat him in their first duel, and only loses the Heroic Rematch because he essentially surrendered after realizing the error of his ways despite still having the advantage in duel termsnote .
- Awesome, but Impractical: See The Magic Poker Equation. Even by the standards of this series, he's really lucky to get even one monster on the Field. His first move in both of his Duels with Yami Yugi are exactly the same, with him managing to get "Backup Gardna" (the one monster in his Deck he can summon without a special condition needing to be met) after using "Guardian Treasure", which forces him to discard five cards in exchange for getting to draw an extra card during each Draw Phase. In addition, by sheer luck, each of these draws gives him a "Guardian" monster and the Equip Spell he needs to Summon it, and if Gardna weren't on the field, he'd have to equip it to one of his opponent's monsters, potentially giving them an advantage. Adding on to this is the fact that most of his Spells and Traps revolve around protecting his monsters, which would render them useless in the event that he doesn't have one.
- Batman Gambit: He goads Yami Yugi into playing the Seal of Orichalcos, and beating him while he is under the influence.
- Berserk Button: Do not send any of his monsters to the graveyard, especially Eatos (which he considers his mother).
- The Chessmaster: Manipulates Dark Yugi into playing the Seal of Orichalcos and is ready to defend himself when it comes.
- The Coats Are Off: Before his first duel with Dark Yugi he tosses his Badass Longcoat off. Notably, he manages to win.
- Dark and Troubled Past: The darkest of Dartz's men.
- The Dragon: To Dartz.
- Evil Counterpart: Is sometimes seen as Dark Yugi's.
- Excalibur in the Rust: Variation. His cards are so old that the ink is fading and the edges are frayed, and he even had to paste new card backs onto them to still be able to play them without marking his deck. That doesn't change the fact that he has one of the most powerful decks in the series.
- A Father to His Men: To his monsters. He absolutely hates it when a monster of his is sent to the graveyard. In the rematch with Dark Yugi, he surrenders by sacrificing all of his Life Points to revive all of his monsters from the graveyard.
- Genius Bruiser: He's physically imposing and a strong duelist, but is also intelligent and has a strong grasp of proper strategy.
- HeelFace Door-Slam: He attempts to turn on Dartz and gets his soul taken for it.
- HeelFace Turn: He eventually turns on Dartz.
- Hotblooded Sideburns: They point out.
- Hypocrite: Thanks to the influence of the Seal of Orichalcos he becomes one in his second duel with the Pharaoh. He claims he'll never give up on his monsters and even points out the flaws behind Yami Yugi sacrificing his monsters through Catapult Turtle to win. In their next duel with each other, the moment Guardian Dreadscythe is summoned to his field, Rafael ends up destroying all of his other monsters in order to defeat the Pharaoh, not unlike how Yami himself sacrificed his monsters to win.
- Insane Troll Logic: What's his basis for believing the Pharaoh is evil, which is also the crux of his "The Reason You Suck" Speech? The Pharaoh doesn't remember his past, so it's possible he was evil, therefore he definitely was.
- Knight Templar: A perfect counterpart to Dark Yugi, only more ruthless.
- The Magic Poker Equation: The series as a whole is an example of this trope, but Rafael's drawing ability still stands out. In both his duels, his opening move is a card that discards his entire starting hand to draw two extra cards each turn, and he still manages to duel competently. Further, he uses Guardian monsters, which require specific Equip Cards in play to be used, but he tends to always draw those Equip Cards with their corresponding Guardian monster at once. That's also not getting into him having Magic Cards he can activate from the Graveyard and from his hand on an opponent's turn.
- Nice Job Fixing It, Villain!: Gives Yugi the Claw of Hermos before the rematch which Yugi uses to destroy Dreadscythe and open his eyes as well as defeat Dartz with later on.
- Noble Demon: The only one of Dartz's minions that isn't Ax-Crazy.
- Redemption Earns Life: After his loss against Dark Yugi.
- Spell My Name with an "S": Rafael or Raphael?
- Start of Darkness: Heartbreakingly highlighted in his past flashbacks.
- Token Good Teammate: He's the least evil guy of Dartz's minions.
- Utopia Justifies the Means: He thinks Dartz will usher in a new golden age for the world, and will do anything to help him do it.
- Well-Intentioned Extremist: The only one who's not having a Slasher Smile or Smug Super, having a vendetta against a certain organization and fight anyone just because they're there. Also the only one that honestly believes that Dartz will inspire world peace.
- When He Smiles: Gives a beautiful one at the end of his second duel, after seeing the spirits of his family. It's a beautiful moment because he hasn't had anything to truly smile for in years.
- Worthy Opponent: To Yugi. In their first duel he introduced himself as a true duelist, which Yugi finds ridiculous. In the Heroic Rematch, Yugi calls him a true duelist himself.
- The Worf Effect: As soon as he tries to turn good, he gets defeated by Dartz himself.
- You Can't Fight Fate: Or so he believes, anyway. Ironically, according to Dark Yugi, his bonds with his family and monsters hold the power to change destiny.
- You Have Outlived Your Usefulness: Hates duelists who treat monsters this way, but resorts to this himself after Eatos is destroyed and Deathscythe hits the field (granted, this is after he played The Seal of Orichalcos). Dartz does this to him once he's no longer useful.
- Your Princess Is in Another Castle!: Dark Yugi assumes he has gained a great advantage when he finally manages to destroy Guardian Eatos in their rematch, sending Rafael into a near breakdown. But while Eatos is Rafael's favorite card and extremely powerful, destroying her summons Guardian Dreadscythe, which is even worse.
- Voiced by: Yukinara Iemura (JP), Ted Lewis (EN)
One of Dartz's henchmen, he and his little brother were caught in a warzone in a city caught between two countries supplied with Kaiba Corp weapons. When his brother was killed in battle, Amelda developed a deep hatred of Kaiba Corp though it turns out to be Dartz who did it.
The first time he's shown dueling, he uses Pegasus' stolen deck along with fire cards focusing on Balrog. His true deck has a military theme, with soldiers, tanks, etc. His trump cards are Soldier Revolt and Air Fortress Ziggurat.
- Bare Your Midriff: Makes you think Dartz has two Dark Chicks working for him.
- Berserk Button: Seeing the Kaiba Corp helicopters makes him furious, as he thinks Seto is just like Gozaburo.
- Confusion Fu: He uses some very unorthodox strategies and cards, but they work.
- Dude Looks Like a Lady: Even his name sounds female (in the original, at least).
- Evil Counterpart: Kaiba's second one in the anime.
- Evil Genius: Disguises himself to move about and uses tricky dueling tactics.
- Playing with Fire: His deck motif the first time around.
- Revenge by Proxy: Wants revenge on Seto simply because his adopted father's weapons were the result of his brother's death.
- Shout-Out: His dub name is based off the famous occultist Alister Crowley, whose unicursal hexagram is the basis for the Seal of Orichalcos.
- Start of Darkness: Survived a terrible war but lost his beloved brother.
- Tragic Keepsake: Carries his brother's favorite Dyna Dude action figure to always remember him.
- Used to Be a Sweet Kid: He once was a proud big brother to his younger sibling until Gozaburo, actually Dartz, destroyed his home town. And he used to actually look like a normal boy.
- Voiced by: Takeshi Maeda (JP), Marc Thompson (EN)
One of Dartz's henchmen, he was a street kid who befriended a nun in a church owned by a gang. When the church was set on fire, Varon beat up the gang and blamed them, and was sent to prison. He drifted through the system getting into fights constantly until Dartz recruited him who had that church burnt for the purpose of having him join in the first place.
He uses an Armor deck, in which the monsters are parts of cybernetic armor (like helmet, boots, gauntlet, shield, etc) that actually attach to him. Since the Seal of Orichalcos makes the duel real, he can attack the opponent personally and beat them senseless. His trump cards include Big Bang Blow and Buster Pyle.
- Accent Adaptation: Has a cockney accent in the dub, though it is so bad is is mistaken for an Australian one.
- Attack! Attack! Attack!: At one point, he even declares that he doesn't care if his opponent has an obvious trap card set, he would still attack.
- Ax-Crazy: He doesn't look very stable when he defeats Rebecca and Ryuji Otogi.
- Awesomeness by Analysis: His Psychic Armor Head has an AI that analyzes his opponent's cards and gives him advice.
- The Berserker: Rushes into any situation where there's a battle without thinking of the consequences, and is willing to duel anyone, even if it means not taking their souls away.
- Blood Knight: He loves to fight no matter what, which can help and hindrance him at times.
- Boisterous Bruiser: He talks tough and hits tougher.
- The Brute: His deck literally allows him to win with just punching rather than complex plans that actually pay off.
- Compressed Hair: His helmet hair is something to behold.
- Evil Counterpart: Is arguably this to Joey. He's who Joey could have turned into if things at home had gotten a little bit worse.
- Graceful Loser: After losing his duel with Joey, he calmly accepts his defeat and tells Joey it's up to the latter to save Mai, before having his soul taken away.
- Kick the Dog: His duel with Rebecca and Duke where he harms them repeatedly with his armor cards (duels in the Doma Arc cause realistic damage to players).
- Murder the Hypotenuse: He tries to do this to Joey, whom he sees as an obstacle to Mai.
- Powered Armor: His deck motif.
- Shout-Out: His back story is a reference to Cyborg 009.
- Smug Super: What the dub makes him out to be.
- Street Urchin: After his home at the church was burnt down by Dartz he pretty much lived on the streets until he joined Dartz.
- Yandere: For Mai, claiming that she's the only one who can understand him. He gets better, though.
- Worthy Opponent: He and Joey gain a lot of respect for each other over the course of their duel.
A duelist working for Dartz, he duels Yugi to test out the powers of the Seal of Orichalcos. He plays a Warrior deck designed to swarm the field. In his duel against Yugi, he added the stolen Obelisk the Tormentor. When he loses, he manages to pass Obelisk to Rafael before his soul is taken.
- Beard of Evil: Sports a sharp-looking beard and mustache.
- Bilingual Bonus: He speaks in Latin in the dub before he challenges Rex and Weevil.
- Black Cloak: His attire.
- Boring Yet Practical: His dueling strategy is extremely basic — mass several Warrior-type monsters at once, then use Spell and Trap card support to protect them and increase their ATK to pose a threat. It's a very simple strategy and most of his cards have likewise straightforward effects, but backed by the Seal of Orichalcos which enhances both his swarming and his ATK-boosting capabilities, he's strong enough to give Yami Yugi a good duel.
- Establishing Character Moment: For the entire Doma organization, unveiling their dangerous-looking Duel Disk knock-off, the Seal of Orichalcos, and he can control the God Cards and capture souls.
- Flat Character: Who is this guy? Why does he work for Dartz? What type of person is he? Questions we never get answers to.
- The Friend Nobody Likes: In the dub, Rafael, Alister, and Valon constantly mock him under their breath and don't care when he is defeated and loses his soul. In the original version, they were more respectful and became sad when he lost his soul.
- Heroic RRoD: While not a hero, using Obelisk the Tormentor while not considered worthy takes its toll on him. The Seal of Orichalcos is the only thing powerful enough to allow him to use it, and even then, he becomes dizzy and almost passes out from the strain.
- High-Class Glass: Wears a monocle.
- I'm Dying, Please Take My MacGuffin: In a somewhat unusual example where a villain does it, he throws the Obelisk card to Rafael just before his soul is taken.
- No Name Given: In the dub.
- Offscreen Moment of Awesome: The way he defeated Haga and Ryuzaki by himself counts.
- Starter Villain: He exists to show off the power of the Doma organization, then lose and get his soul taken after the organization has been established as a proper threat.
- Your Soul Is Mine: It's practically his first line in the dub."The problem shall be yours, once I strip you two fools of your souls."
- Zerg Rush: His strongest monsters that we see are Makyura (1600) and Warrior Dai Grepher (1700). He instead prefers to swarm the field with weak Warriors and use the Seal of Orichalcos and other cards to pump up their attack so they pose a threat.
- Voiced by Shunsuke Kazama (JP), Dan Green (EN)
- Fake Ultimate Hero: Despite being built up as one of the three Big Goods of the arc, Timaeus and his comrades wind up being fairly helpless against the reborn Great Leviathan. It's ultimately Yami's own powers and the Egyptian Gods that put the Leviathan and the Orichalcos down for good.
- Fusion Dance: In Dragon form, he merges with other monsters to form more powerful ones.
- Voiced by Kenjiro Tsuda (JP), Eric Stuart (EN)
- Fake Ultimate Hero: Despite being built up as one of the three Big Goods of the arc, Critias and his comrades wind up being fairly helpless against the reborn Great Leviathan. It's ultimately Yami's own powers and the Egyptian Gods that put the Leviathan and the Orichalcos down for good.
- Fusion Dance: In Dragon form, he merges with trap cards.
- Voiced by Hiroki Takahashi (JP), Wayne Grayson (EN)
- Fake Ultimate Hero: Despite being built up as one of the three Big Goods of the arc, Hermos and his comrades wind up being fairly helpless against the reborn Great Leviathan. It's ultimately Yami's own powers and the Egyptian Gods that put the Leviathan and the Orichalcos down for good.
- Fusion Dance: In Dragon form, like Timaeus he merges with other monsters, however, instead of creating a new monster, they instead form powerful weapons that other monsters can use.
- Voiced by Mariko Nagahama (JP), Bella Hudson (EN)
- Voiced by Yusaku Yara (JP), Brian Maillard (EN)
- Voiced by Chieko Higuchi (ancient times, JP), Tomomi Yachi (present time, JP), Veronica Taylor (EN)
Siegfried von Schroeder (ジークフリード・フォン・シュレイダー; jiikufuriido fon shureidaa)/
Sieg Lloyd (ジーク・ロイド; jiiku roido)
- Voiced by: Eisuke Tsuda (JP), Pete Zarustica (EN)
Siegfried von Schroeder is the main antagonist of the KaibaCorp Grand Prix arc. Siegfried is the son of a CEO of a major weapons developer... like Kaiba. When his father went insane, Siegfried took over the company and retooled it as a gaming company... like Kaiba. Siegfried hit upon a huge breakthrough with the development of holographic projectors for Duel Monsters... like Kaiba. That's where the parallels end, because Kaiba signed his business deal with Pegasus first, and Siegfried was left in ruins, his company falling into obscurity while Kaiba Corp became the Mega-Corp we all know and love. His main goal now is to discredit Seto Kaiba and his company through any means necessary.
He uses a Valkyrie deck, based on Der Ring des Nibelungen, and is loaded with cards that let him make extra draws, increase his life points, block his opponent's attacks, and remove his opponent's monsters from play. His trump cards are Ride of the Valkyries and Valkyrie Brunhilde.
- Agent Peacock: In the same vein as Pegasus. He might be effeminate and foppish, but don't make the mistake of thinking it means he's a poor duelist: he's able to go toe-to-toe with Kaiba and give him a heck of a duel before he falls.
- Aloof Big Brother: To Leon, whom he more or less ignored prior to recruiting him for the attack on Kaiba.
- Always Someone Better: The dub almost invokes it by name with the phrase "always one step ahead" becoming Arc Words for how Siegfried sees Kaiba.
- Amazon Brigade: His Valkyrie deck, which doesn't contain a single male creature (at least that we see).
- Ambiguously Gay: Even moreso than Pegasus, what with his pink hair, pink clothes, effeminate mannerisms, Amazon Brigade cards and stereotypical German accent.
- Anti-Villain: Siegfried's not particularly sympathetic, but unlike the rest of the show's Big Bads (and many of its minor antagonists) he's not out to Take Over the World or even physically hurt anybodynote . He just wants to take down the man he holds responsible for his failures and maybe save his company in the process, and Kaiba isn't exactly a saint.
- Arc Villain: Of the KaibaCorp Grand Prix arc.
- Badass in a Nice Suit: Sharply dressed and a major Agent Peacock. He even goes so far as to ask the referee not to disqualify Rex and Weevil because he wore it for the tournament.
- Because Destiny Says So: In both his duels with Joey and Kaiba, he constantly says the Goddess of Fortune is on his side, so he is destined to win.
- Big Bad: Of the KaibaCorp Grand Prix arc, with his younger brother as The Dragon and Final Boss.
- Broken Pedestal: To Leon after the full scope of his scheme comes out.
- The Chessmaster: Plans out his duels and his overall scheme for the KC Grand Prix down to the last detail. He even has a backup plan in case he's beaten or ejected from the tournament.
- Conspicuous Consumption: He has a fancy castle, an army of maids, private jets, and swimming pools filled with fresh milk... to hide the fact that his life of luxury is in jeopardy since SchroederCorp is going broke.
- Corrupt Corporate Executive: With the caveat that he's nearly broke and his corrupt actions are an attempt at saving his company and avenging himself on the people he holds responsible.
- The Cracker: Broke Gozaburo's computer security as a child, and repeatedly hacks Seto Kaiba's systems as an adult.
- Creepy Child: Kaiba remembers him as a disturbing child—which coming from Seto Kaiba is saying a lot.
- Driven by Envy: Of Kaiba and his company.
- Dude Looks Like a Lady: His name and voice are pretty much the only masculine things about him.
- Easily Forgiven: Leon forgives him for all the trouble he causes once Yugi defeats him, encouraging him to try and make their company the best he can.
- Evil Counterpart: Kaiba's third one in the anime, and the most obvious. He's the son of a weapons developer, who took his company into the gaming industry after his father's fall from power. He's also the older of two siblings, with the younger one being considerably kinder and friendlier. Where their characters diverge is in their success, and their treatment of the younger sibling in question—Kaiba's a successful businessman whose brother is his Morality Pet, while Siegfried's company has been reduced to obscurity, and he uses Leon as a pawn.
- Evil Is Petty: Pegasus steals souls to resurrect his dead wife. Marik wants to kill Yugi because he thinks he is reponsible for the death of his father. Dartz and The Spirit of the Millenium Ring are planning The End of the World as We Know It. Even Noah and Gozaburo plan to steal the gang's bodies and abandon them in a virtual prison. Siegfried? He just wants to bring down KaibaCorp while making a killing himself.
- Filler Villain: The third and last before the final arc.
- Foil: Zigfried was born into wealth and inherited his company when his father lost his mind. Seto Kaiba was born poor and usurped control of KaibaCorp from his adoptive father.
- Freudian Excuse: His father went mad trying to compete with KaibaCorp. He got out of the weapons' trade to avoid having the same thing happen to him, only for Seto to take KaibaCorp into the gaming industry as well and corner the market. He finally created an invention he thought would save him from fading into obscurity, only for Seto to have the same idea, and cut a deal with Pegasus first. His methods may be underhanded, but his resentment of Kaiba is understandable.
- Funetik Aksent: In the dub he's given a heavy German accent.
- Generation Xerox: A flashback shows that his father and Gozaburo had the same antagonistic relationship that he and Seto do now.
- Glass Cannon: Siegfried can pull off an impressive One-Turn Kill with his Valkyries, and is even able to do it against two opponents at once. However, without his Valkyries and the means to summon them, his dueling stalls and he relies heavily on draw power and stalling until he can get the cards he needs, and then if his One-Turn Kill doesn't work, he loses all his Valkyries and is back to square one. As part of this he is heavily reliant on Nibelung's Ring and his Goddess Spell cards to get rid of the opponent's monsters before they can hit the field, and has a more difficult time dealing with opponents that find ways to play around this combo.
- Gratuitous German: "Auf Wiedersehen, Herr Kaiba." Also see Theme Naming below.
- Green-Eyed Monster: Siegfried's jealousy is his raison d'etre.
- Inferiority Superiority Complex: Siegfried's desire to prove he's better than everyone stems from his family's historical humiliation at the hands of the Kaibas.
- Jerkass: Like Kaiba, he constantly mocks Joey as an inferior duelist and nothing but a waste of his time. In the Japanese version, he at least compliments Joey for forcing him to duel seriously when Joey manages to reduce his life points to 100, but in the English version, he is completely unphased and continues to say Joey is a loser.
- Karma Houdini: Aside from being humiliated in public, his blatant attempts at cheating and cyber-crime don't seem to be punished at all. The epilogue of the series even shows that he managed to save his company through a business deal with Pegasus.
- Last Villain Stand: In an odd way, the entire arc is one for Siegfried. His company is going down, and despite his claims to the contrary, he knows it. The attack on the KC Grand Prix is an attempt to halt this or (metaphorically) die trying.
- Let's Get Dangerous!: He doesn't take his duel with Joey seriously at all until he survives the Ride of the Valkyries.
- Manipulative Bastard: Uses Leon's desire for the family's approval to force him into doing his dirty work.
- Never My Fault: Puts all the blame for the fall of the Schroeder Company on Kaiba and KaibaCorp, refusing to acknowledge that his own failings as a businessman may have played a role.
- Nice Job Fixing It, Villain!: Yugi likely wouldn't have been able to summon Dark Magician so easily during the duel with Leon had the Golden Castle not sent it to his Graveyard.
- Speaking of which, the reason why it was there in the first place. Golden Castle was modified by Siegfried to not only be indestructible, but at the start of the player's turn, the opponent must discard half of their deck to the Graveyard as a maintenance cost. When Yugi was unable to pay the cost because he had one card left in his deck, the card destroyed itself.
- Oh, Crap!: Comes very close to losing it when his Three Goddess Combo fails to work on Kaiba. When viewing the top three cards on Kaiba's deck, he sees that all three are the Blue-Eyes White Dragon cards, making his strategy ineffective.
- Attempts to pull a Batman Gambit on Kaiba should his brother lose to Yugi as a last ditch effort to defeat him. Kaiba was one step ahead of him, and thoroughly pulls his own Batman Gambit.
- Yugi does this too. Sieg thinks his Golden Castle of Stromberg is indestructible, but when Yugi is unable to discard half his deck it goes away, as does the overwhelming and unwanted advantage it gives Leon.
- One-Hit Kill: Specializes in using Ride of the Valkyries to do this, and was even able to defeat Weevil and Rex simultaneously in his first turn. He wasn't pleased when Joey and later Kaiba were able to survive it.
- Parental Favoritism: He was the favorite, his brother Leon The Unfavorite. However, as the show demonstrates, this didn't do Siegfried any good, as he now has all the family's hopes and grudges sitting on his shoulders.
- Promotion to Parent: For Leon, his younger brother and almost Morality Pet.
- The Resenter: Towards KaibaCorp, and Seto Kaiba in particular, seeing them as having ruined his family and his life.
- Riches to Rags: Siegfried and his family are on their way there, and he knows it. His attack on the KC Grand Prix is equal parts a last ditch attempt at averting the collapse of his company, and him futilely lashing out at the man he holds responsible.
- Smug Snake: He's very full of himself—though some of this is cover for an inferiority complex.
- Something About a Rose: Always carries at least one rose on his person.
- Sore Loser: He doesn't take defeat well.
- Spell My Name with an "S": Siegfried, Sigfried, Ziegfried, or Zigfried? And while we're at it; Schroder, Schroeder, or Schroider?
- Stage Mom: A brotherly example. Siegfried pushing his younger brother Leon to beat Yugi even if it means cheating. Joey lampshades this in the dub.Zigfried: Now crush Yugi Muto just like we rehearsed it a thousand times!
Joey: Sheesh... Who knew Ziggy was such a stage mom.
- Theme Naming: His name is derived from a character from Richard Wagner's opera, The Ring of the Nibelung. One of his cards is even called Nibelung's Ring! And he has a Valkyrie deck, which is a reference to one of the Ring operas, Die Walküre (The Valkyrie).
- The Unfought: The only time where The Heavy of the arc never faces off with Yugi or Dark Yugi. Instead he's taken down by Kaiba, while Yugi contends with his younger brother, Leon.
- This Means War!: He does not take his duel with Jounouchi seriously at all, until Jounouchi gets in a good hit on him with Jinzo. Things quickly change after that.
- Unknown Rival: Though he suspects Siegfried is the one who's hacking his computer systems, Kaiba has to dig through his family history before he realizes who the guy really is. And even then he doesn't take him seriously.
- Weak, but Skilled: Siegfried's Valkyries have relatively low ATK and DEF for their levels; Dritte, his only seen level 4 monster has 1000 ATK, Zwei and Erste, levels 5 and 6 respectively, both have 1600 ATK, and his strongest seen monster Brunhilde has 1800 ATK. But they more than make up for it with their various effects and Spells and Traps
- Xanatos Gambit: Enters the tournament and acts obviously evil so that Kaiba will suspect him. At the same time his equally talented kid brother is also in the tournament. Because of his antics, by the time the truth is revealed Kaiba can't disqualify Leon or else he'll lose PR (he'd hyped the tournament up so pulling the plug on the climax and main event would be PR suicide.)
- You Gotta Have Blue Hair: His blindingly pink, waist-length hair is gaudy enough that people actually lampshade it in the show.
Leonhart von Schroider (レオンハルト・フォン・シュレイダー; reonharuto fon shureidaa) /Leon Wilson (レオン・ウィルソン; reon wiruson)
- Voiced by: Seiko Noguchi (JP), Andrew Rannells (EN)
The younger brother of failed corporate mogul Siegfried von Schroder, Leon dueled for fun under an alias until Siegfried found out about his hobby and recruited him to help him take down KaibaCorp. A cheerful kid, Leon loves his brother but isn't entirely on-board with his schemes.
He uses a fairy-tale themed deck designed specifically for him by Pegasus. His trump cards include Hex Trude, Cinderella, Globerman, and Princess of Thorns. Siegfried later gives him Golden Castle of Stromberg, an illegal Magic Card that's almost impossible to get rid of.
- Arc Villain: The Dragon and Final Boss of the KC Grand Prix arc.
- Anti-Villain: Leon's barely a villain, and thinks he's just playing in a tournament on behalf of his family. Unfortunately for him, he's actually being manipulated by his brother, Siegfried.
- Big Brother Worship: Siegfried used this to his full advantage.
- Cheaters Never Prosper: Toyed with. Cheating certainly doesn't help Leon, but that's because once he finds out the move he's used is illegal, he tries to throw the duel.
- Cheerful Child: Leon is very happy and well-adjusted.
- Child Prodigy: At dueling.
- The Cutie: Look at the kid's picture: he's adorable.
- The Dragon: To his older brother. He isn't necessarily aware of this.
- Dragon-in-Chief: Subverted and downplayed both. Leon's a better duelist than Siegfried and once he makes it into the finals, the entire plan depends on him. However, Siegfried has anticipated that Leon may not cooperate fully once the truth comes out, and has multiple contingencies in place to ensure that Leon has to carry out their scheme, regardless of his personal feelings.
- Dragon Their Feet: Justified—and twice over at that. Since all duels are one-on-one, Leon couldn't involve himself in Siegfried's duel with Kaiba, no matter how much he might have wanted to. Additionally, the whole plan was for the Schroeder brothers to enter the tournament under two separate names so that if one of them was defeated or found out and expelled, the other would still have a shot at the championship. If Leon had so much as reacted during Kaiba's duel with Siegfried, he would have ruined the scheme.
- Enfante Terrible: Downplayed. Leon's an angry kid out to destroy KaibaCorp, but that's more his brother's influence than anything else.
- Evil Counterpart: To Mokuba, although the evil part is a bit of a stretch. Both are the younger, happier brothers of driven, ruthless businessmen, who try to support their brothers no matter what. The difference is that Leon is actually a better duelist than Siegfried, and that he isn't entirely onboard with what his brother plans to do, and is being used by said brother.
- Fair-Play Villain: Exaggerated. Leon hates cheating to the point of trying to back out of his match with Yugi after finding out Siegfried has tricked him into playing an illegal card.
- Filler Villain: Does not exist in the manga.
- Final Boss: Of the KaibaCorp Grand Prix arc. Siegfried may be the Arc Villain and Big Bad, but Leon's the one that Yugi has to take down in the last duel of the arc.
- Foil: His relationship with Siegfried parallels the one between Kaiba and Mokuba. Additionally, he's also a foil to Siegfried himself, being far less obsessed with defeating Kaiba and much more interested in dueling for its own sake.
- HeelFace Turn: When he discovers the degree to which Siegfried was using him, Leon turns on his brother and helps Yugi destroy his own Golden Castle of Stromberg.
- Hero-Worshipper: Of Siegfried.
- Heroic BSoD: When he learns of Siegfried's true plan and that Golden Castle of Stromberg is an illegal Game-Breaker card, he almost quits the duel, as he wanted to win fairly. Yugi cheers him up and convinces him to keep at it.
- I've Never Seen Anything Like This Before: The Golden Castle of Stromberg and justified on two ends. The castle itself is a explicitly rare one of a kind card that was given away as a tournament prize card. Much like Pegasus's Toon World at the time, nobody knew how to counter the card not only because of its rarity but because the card itself was an explicitly forbidden card. The Golden Castle was designed by Pegasus, but it was never fully developed (something made without checking it for gameplay balance or to be completely overpowered, so to speak) for official play. Yugi had to think outside the box to overcome it; partially because he and others didn't think they'd be up against such a game breaking card.
- Know When to Fold 'Em: Tries to throw the duel once he realizes that Siegfried has tricked him into cheating. He also tries to get Siegfried to give up on defeating Kaiba, since it's never going to happen and is ruining their family.
- Lethal Joke Character: His opponents and spectators have a tendency of assuming he's weak because he's a kid and his fairy-tale cards are cutesy and silly. Then he starts winning.
- Morality Pet: To his older brother Siegfried, though Siegfried isn't afraid to use him if it serves his interests.
- Nice Guy: One of the nicest characters in the original series. Leon duels for fun, and not in a Blood Knight way either; he just likes to play games and meet people. Mind you, that doesn't mean he's not a very capable duelist.
- Noble Top Enforcer: Exaggerated. Not only is Leon a much better person than his brother (himself an antivillain and pretty far down the Sliding Scale of Antagonist Vileness), but he doesn't even realize he is a villain until the last episode of the arc.
- Parental Neglect: His parents shut him out of their lives and Siegfried's for fear he would distract the older boy from his studies.
- The Un-Favourite: Siegfried was the favourite, while Leon spent most of his childhood being completely ignored.
- Unwitting Pawn: In Siegfried's plan. He thinks that all Siegfried wants to do is have a von Schroeder crowned KC Grand Champion, to humiliate Kaiba and help publicise the launch of one of Siegfried's new gaming systems. Instead, Siegfried's using him to collapse KaibaCorp's computers and cost their rival vast amounts of time and money.
- You Gotta Have Blue Hair: Like his brother, he has a weird hair color.
Dr. Alex Brisbane
- Voiced by Pete Zarustica
A colleague and protege of Solomon Muto, Alex Brisbane was with him when he disappeared on a secret expedition in India. He then led Yugi and friends to the Capsule Monsters board game. Alex was possessed by Alexander the Great's evil half for the majority of the series, seeking to use Yugi and his friends for his own gain.
- Demonic Possession: He is possessed by the evil Alexander.
- Evil Brit: Only when possessed, as otherwise he's quite nice.
- Expy: Of Ryou Bakura. Alex is a well-meaning archaeologist who was possessed by someone who once wore the Millennium Ring.
- Famous Ancestor: He's a direct descendant of Alexander the Great.
- Let's Split Up, Gang: He got possessed when he and Solomon split up to explore the pyramid more thoroughly.
Alexander the Great (King Alexandros III)
- Voiced by Pete Zarustica
Alexander the Great is the famous historical conqueror of the same name. During his conquest of half the world, he stumbled upon the Millennium Ring, which gave him great power but corrupted his mind. The Ring split his soul into two pieces—a gentle, kindhearted side and a war-mongering, ruthless side. Shadi approached him and demanded he be proven worthy of the ultimate power he sought, and Alexander faced the Capsule Monsters trials.
While he proved successful, the doorway wouldn't open. The Millennium Ring deserted him—but not before taking his vassals' lives, as well as his own, trapping their souls within the pyramid. Alexander's peaceful half fled his body and escaped into the Capsule Monsters map, while his darker half waited for 2,000 years to possess Alex Brisbane in a bid to claim the power he craved. He tricked Yugi and friends into entering the Capsule Monsters world and clearing the five challenges. Alexander then faced them in battle, but was defeated thanks to the combined strength of Yugi's friends. Alexander's evil half was destroyed, while his good half departed for the afterlife with his vassals.
- Bad Boss: Alexander is condescending to his vassals and declares them useless when Yugi's friends damage their monsters, and is perfectly willing to sacrifice them for his own gain.
- Beethoven Was an Alien Spy: Alexander the Great had the Millennium Ring, which helped him conquer the world.
- Big Bad: The evil half of his soul is this for Capsule Monsters, since he lured Yugi and his friends into the game while possessing Brisbane and using them to obtain the power to control the world.
- Break Them by Talking: Alexander gives a speech to Yami over their different approaches in regards to allies, saying that sacrificing his friends is what he needs to be powerful enough to put up a fight.
- Devour the Dragon: Alexander does this to his vassals during the final battle, sacrificing their monsters to summon Reshef the Dark Being and making sure that when his Reshef is attacked, they take damage instead of him.
- Enemy Without: Thanks to the Millennium Ring, his soul was split into two beings.
- Evil Brit: He has a British accent when possessing Brisbane, as well as in flashbacks.
- Familial Body Snatcher: Alex Brisbane is a direct descendant of Alexander the Great and ends up possessed by his soul as a result.
- Foil: To Yami Yugi. While they're both rulers of Ancient Egypt and both wear Duel Armor, letting them merge with monsters, their approach to allies couldn't be more different. Shadi lampshades it after the battle's over.
- Helpless Good Side: While Alexander's good half is able to assist Yugi and his friends, when he merges with his evil half the evil side wins out, suppressing him completely until he's destroyed.
- Hyde Plays Jekyll: Alexander poses as Alex Brisbane when the group meets him, and when the good Alexander attempts to reunite with and overpower his other half, he pretends to have been freed to trick Yugi's grandpa.
- Jekyll & Hyde: The Millennium Ring split Alexander's soul into two halves, one his peaceful side and the other his war-mongering side. The evil side notes that without him Alexander could have never conquered half the globe.
- Sealed Evil in a Can: Alexander's evil half was sealed in the pyramid while his good side was left in the Capsule Monsters world.
- Split-Personality Merge: The good Alexander tries to do this to overpower his dark half, but the evil side wins out and suppresses him.
- Unreliable Narrator: Alexander's good half says he failed the five trials, while his evil half says he completed the five trials, but the doorway refused to open. It's implied the latter is correct, as otherwise the final battle couldn't have happened.
- You Have Outlived Your Usefulness: He sacrifices his servants' monsters and banishes them from the game to summon his Seven-Armed Fiend.
- Voiced by Unknown
Alexander's four most loyal servants, who stayed with him even after his armies deserted him. They consist of a young man, a young woman, a middle-aged man, and an older man. Their souls were trapped within the pyramid by the Millennium Ring, and they assist Alexander's evil side in the final battle. Upon his defeat, they depart with his good half to the afterlife.
- Attack Reflector: The female vassal commands Reflect Bounder, who bounces attacks back at opponents.
- Human Shield: Alexander uses his vassals this way, using their monster's energy to power Reshef. When Reshef is damaged, they feel the pain instead.
- No Name Given: None of them are named.
- Similar Squad: They're deliberately similar to Yugi's group of friends and family, highlighting the contrast between Yugi and Alexander.
- Undying Loyalty: They stayed with Alexander even after death, despite how he treats them in the Shadow Game.
- Creepy Child: In-universe, she creeps Joey out by appearing from nowhere to invite them in.
- Mr. Exposition: Her role is basically to provide exposition.
- No Name Given: She isn't named.
- Small Role, Big Impact: She reveals that someone else passed the five tests, and the pendant she gives Tea turns out to be what Alexander needs to claim his prize.
- Human Sacrifice: She volunteers herself for this in a ritual that will keep the Blue-Eyes White Dragon protecting her village.
- Mysterious Waif: She spends most of her screen time as a quiet, mysterious girl, and her prayers help awaken the Blue-Eyes White Dragon.
- No Name Given: She isn't named.
- Not So Above It All: She tells Joey that they must solve one more riddle after passing the test, only to reveal she was joking.
Shougo Aoyama (青山翔吾; Aoyama Shōgo)
- Voiced by: Eiko Yamada
A main character in Toei's Yu-Gi-Oh movie. Shougo is a timid duelist who has a powerful Red-Eyes Black Dragon card, but is too scared to use it properly in a duel and fakes superiority to get out of dueling. Yugi and Joey help him gain the courage to fight, and he's last seen finally dueling with others.
- Dirty Coward: He uses the fact that he has the Red Eyes to get out of duels, but he admits that he's scared to lose it.
- Grew a Spine: When Yugi is on the ropes and only the Red-Eyes can help him win, Shougo finally stands up for himself and vows to fight with the Red-Eyes. He's seen in the credits dueling with others, including his former bullies.
- Heroic BSoD: He breaks down and admits that he is too scared to fight to Yugi and Joey.
- Remember the New Guy?: He's seen as one of Yugi's close friends, but never appeared before or after the movie.
- Safety in Indifference: Shougo is terrible at card games so when he obtains the rare "Red Eyes Black Dragon" he prefers to just brag about it because he's scared he will lose even if he does use it in a duel.
- Shrinking Violet: He's timid and easily scared, and is so scared of losing that he doesn't duel.
- Spotlight-Stealing Squad: Shougo is practically the main character of the movie, with his internal conflict being the film's main plot while Yugi and Kaiba's duel is secondary.
- You Gotta Have Blue Hair: He has mint-green hair.
Anubis (アヌビス; anubisu)
- Voiced by: Kouji Ishii (Japanese), Scottie Ray (English), Pablo Adán (European Spanish)
The Big Bad of Yu-Gi-Oh! The Movie: Pyramid of Light, Anubis was an ancient sorcerer that served Akunadin in Ancient Egypt. Akunadin made an eighth Millennium Item, the Pyramid of Light, for his son Seto, intending for it to allow Seto to challenge Atem and his Millennium Puzzle that held power over Darkness. However, Anubis stole the Pyramid of Light to challenge Atem himself. Unable to control its full power since he was not Seto, he was destroyed, but his soul remained sealed in the Pyramid of Light. In the modern day he seeks to drain the life from Seto and Yami Yugi to fuel his resurrection.
Anubis uses a Sphinx deck, focusing on summoning high-level monsters and dealing large amounts of damage to opponents by increasing his cards' attack from the graveyard.
- All There in the Manual: Anubis's entire backstory was relegated to the novelization and not in the movie itself.
- Animal Motifs: Like the god Anubis, he has a jackal motif, wearing a jackal mask in a vison, having his shadow look like one, and later turning into a monstrous jackal.
- Artifact of Doom: The Pyramid of Light can call Shadow Games, transform Anubis into a monster, and feed his monsters with dead souls.
- Badass Cape: Part of his outfit is a long, flowing black mantle.
- Batman Gambit: He places the Pyramid of Light card for Kaiba to find, relying on him to use it in his duel with Yami Yugi so he can start absorbing their life energy to revive himself. Kaiba unknowingly Out-Gambitted him when he tries to destroy the card to deal Yami Yugi a Death by Irony, which would cancel the effects of the Shadow Game if it had happened.
- Big Bad: Of Pyramid of Light.
- Canon Foreigner: He and the Pyramid of Light are movie-exclusive.
- The End of the World as We Know It: Anubis threatens this by summoning duel monsters into reality and siccing them on the world at large. He storyboards it for Yugi at one point.
- Everybody Hates Hades: Anubis is actually a mortal who happens to be named after the god, but the English version omitted his backstory due to spoilers from the then-unaired Season 5, leaving viewers to assume he was the god Anubis.
- Evil Counterpart: In the novelization he's this to Seto, the one who was supposed to receive the Pyramid of Light and challenge Atem, but was completely loyal to him. The Pyramid of Light itself is this trope to the Millennium Puzzle, intended to give Seto the power he needed to challenge Atem on equal ground.
- Evil Sounds Deep: Has a very deep and booming voice.
- Fan Disservice: The bulging veins covering him.
- Fusion Dance: Andro Sphinx and Sphinx Teleia combine into Theinen the Great Sphinx.
- Generic Doomsday Villain: He doesn't have much motive or personality beyond wanting to obtain ultimate power and rule or destroy the world. Even in his backstory in the novelization, he's given zero reason for his treasonous acts and why he'd want to commit such great evil - he's simply evil for the sake of it.
- A God Am I: He's named after an Egyptian god and is called the lord of the dead at one point. Since the movie mainly refers to him as a sorcerer, it's implied he isn't the actual Anubis but was deluded into thinking he was.
- Hellhound: He turns into this after his human body is destroyed.
- Light Is Not Good: He wears the Pyramid of Light, uses the card of the same name, and his monsters are Light-attribute, but he is definitely evil. In the Japanese version, he believes that Light Is Good for him and that the Pharaoh is a case of Dark Is Evil.
- Near-Villain Victory: By the time Anubis takes over the duel, Yugi's deck has been thinned to two cards and he has only 200 LP, which Anubis quickly makes 100. When Yugi makes a comeback, Anubis summons Theinen the Great Sphinx, which is boosted to 35,000 ATK.
- No-Nonsense Nemesis: After Yugi defeats him in a duel, Anubis turns into a monster and decides to skip the card games, attacking his foes directly with intent to kill.
- Noodle Incident: The Pharaoh is stated to have defeated Anubis in a battle long ago, but the circumstances are never explored due to his missing memory. All Anubis says about it is that last time they met he was unable to summon Theinen the Great Sphinx.
- Obviously Evil: He wears spiked pauldrons, a black cape, manifests from a pool of black liquid, and is named after the God of the Dead.
- Ominous Latin Chanting: Egyptian chanting is part of his leimotif.
- One-Winged Angel: Transforms into a Hellhound after losing the duel, dropping the whole duel premise to just kill the heroes himself.
- Only Mostly Dead: His state at the start of the film.
- Back from the Dead: What he achieves during it.
- Our Centaurs Are Different: Theinen the Great Sphinx.
- Red Eyes, Take Warning: The red eyes should also tip you off he's a bad guy.
- Soul Jar: The Pyramid of Light is his.
- Spikes of Villainy: His cape's clasp includes large spikes rising over his shoulders.
- The Starscream: To Akunadin and Atem.
- Take Over the World: Anubis's secondary goal, after destroying most of the world, is to rule over what's left as the new Pharaoh.
- Walking Shirtless Scene: Wears a cape and pants, but no shirt.
- Yin-Yang Bomb: His goal is to absorb the power of both Seto and Yami Yugi to gain their power over light and darkness.
- You Have Outlived Your Usefulness: Invoked by name when he tosses Seto aside to handle Yami Yugi on his own.
- Voiced by: Kento Hayashi (JP), Daniel J. Edwards (EN)
The main antagonist of Yu-Gi-Oh! The Dark Side of Dimensions, Aigami is the leader of the Plana, a mysterious group based out of Egypt that he claims will create a better world. He plans to kill Kaiba and/or Yugi to stop the Pharaoh from being reborn, and also wants revenge on Bakura. Aigami's real name is Diva, and he has a younger sister named Sera.
Aigami uses a Cubic deck, consisting of monsters that have 0 ATK but can use their abilities to sap the ATK of enemy monsters to 0 while his own monsters grow stronger.
- Big Bad: The main villain of The Darkside Of Dimensions.
- Bishōnen: Just look at him.
- The Chosen One: He, Sera, and others were chosen by Shadi to have mysterious powers.
- Composite Character: Acts as a combination of Anubis, Marik, Thief King Bakura, and Bakura. He's a mysterious new student that transferred to Yugi's class (Bakura), is a member of a secret Egyptian sect that wants vengeance for the death of his father-figure and uses a fake identity to gain Yugi's trust (Marik), was one of the few survivors of a murderous rampage that killed everyone around him and swore revenge (Thief King Bakura) and is a movie-exclusive villain that attempts to use a previously-unseen artifact to kill Yugi and Kaiba (Anubis). Then as another throwback to Bakura, in the climax, he's possessed by the evil of the Millennium Ring.
- Dark and Troubled Past: He and his sister, along with other orphans, lived with an abusive man and had to survive with little food.
- Demonic Possession: Near the film's climax, he gets possessed by the Millennium Ring, and transform into a humongous monster with cubes for eyes.
- Fake Memories: He altered the memories of everyone in Domino City, implanting the notion that he was a new student at Domino High School.
- It's All About Me: Aigami's motivations are quite selfish. He wants to stop Kaiba and Yugi because if the Pharaoh is reborn into the world, he and the rest of the Plana will lose their powers and be bound to the world they're in.
- New Transfer Student: Aigami transfers to Yugi's class under mysterious circumstances.
- Near-Villain Victory: If it wasn't for Atem's intervention, Aigami would have won.
- No-Nonsense Nemesis: When he learns that Kaiba has found the pieces of the Millennium Puzzle at the excavated site of the ceremonial battle, he immediately tries to erase him from existence. It only fails thanks to Kaiba's new duel disc, which lets him No-Sell the power of the Quantum Cube, forcing Aigami to duel him instead.
- Reality Warper: His Quantum Cube makes him a low-level one at first, with his powerset mostly consisting of teleporting himself and others, sending people to other dimensions, erasing people from existence, and Dimension Dueling. When the Millennium Ring possesses him and bonds its dark powers with the powers of the Quantum Cube he truly becomes this, as he begins disintegrating everything and everyone around him and is able to call Shadow Games. By the time the final duel's over, it's implied the patch of space where they were dueling was the only thing left on Earth.
- Serial Escalation: Aigami first tries to prevent the Puzzle from being found and completed by stealing its pieces. When that fails, he tries to kill Kaiba, who plans to put the Puzzle back together to duel Atem. When that fails, he tries to kill Yugi, as killing him would ensure the Pharaoh had no vessel to return to, as well as kill Bakura to get revenge for Shadi. When that fails, the Millennium Ring possesses him and goads him to try and kill them both.
- Supernatural Gold Eyes: His eyes are golden, about the same shade as the Millennium Items.
- Superpower Lottery: His Cubic deck is definitely one that triumphs over Yugi and Kaiba in an era where archetypes are still receiving support to the playstyle. A good example shows that in only a single turn, he was able to nearly wipe out either of them or even both of them in a duel if it weren't for an unexplained card drew from a sacred burial ground, an unlikely combo with three trap cards, and a destiny draw.
- Ungrateful Bastard: Despite the fact that Jounouchi helped him out against his bullies, he later banishes him to another dimension and calls him worthless.
- Viewers Are Geniuses: His motives and methodology revolve around quantum physics in the Japanese version, a field of science that tends to be confusing and difficult to understand even to those that study it.
- Visionary Villain: Aigami believes so much in Shadi's vision of a better world beyond dimensions that he thinks Yugi's world is static and has no meaning.
- You Gotta Have Blue Hair: His defining trait is his blue hair.
- Voiced by: Kana Hanazawa (JP), Laurie Hymes (EN)
A little girl in Yu-Gi-Oh! The Dark Side of Dimensions. Sera is Aigami's younger sister and advises and aids him on his mission. She wishes to free him from the darkness he descends into, though in the prequel manga she aids him in trying to kill Kaiba.
In the manga her only known monster is Duza the Meteor Cubic Vessel. In Yu-Gi-Oh! Duel Links, she uses a Constellar and Cubic-themed beatdown deck.
- Ambiguous Innocence: In the prequel manga Sera is a Creepy Child who nearly succeeds in killing Kaiba, but in the movie she's a hero who wants to save Aigami from darkness, opening room for a lot of interpretation.
- The Chosen One: Along with Diva and Mani, she was one of the seven children chosen to inherit the power of the Plana.
- Creepy Child: Sera has knowledge beyond her years, and claims to hear voices from the netherworld. She's also a skilled manipulator, challenges Kaiba to the technological equivalent of a Shadow Game, and is working with Aigami, though in the movie she's quite nice.
- Dark and Troubled Past: She and Diva were orphans living with an abusive carer until Shadi rescued them, and he was later soon killed by Dark Bakura, forcing Sera to grow up with only the other Plana and watch as Diva descended into hatred.
- Expy: As the sister trying to save her brother from a path of darkness, she's the Ishizu to Diva's Marik.
- Manipulative Bastard: In the prequel manga, Sera manipulates Kaiba by playing to his insecurities about the Pharaoh and his own skills, saying he'll never become the duel kingbut if he links with the voice she hears from the netherworld, perhaps he can do something. Her character profile for the movie states that she advises Aigami on his mission while also befriending Yugi.
- Ms. Fanservice: Her Avatar Prana in the prequel manga; a statuesque, buxom lady in a Latex Space Suit.
- Mysterious Waif: In the prequel manga and movie she is a mysterious, young child with great power.
- Never Trust a Trailer: The prequel manga and promotional material for the movie implied she'd be a villain, but in the movie itself she's a hero.
- Reality Warper: As a Plana, she is a mild case of this; capable of teleportation and perceiving different points on the planet at once.
- Wise Beyond Their Years: In the movie, she tries to save Aigami from falling into darkness.
- Voiced by: Satoshi Hino (JP), Tamir Cousins (EN)
A large man in Yu-Gi-Oh! The Dark Side of Dimensions. Mani shares the same mission as Aigami and is selflessly loyal to him no matter what. Like Aigami and Sera, he possesses the power of the Plana.
- Heroic Sacrifice: After the Millennium Ring possesses him, he fights off its control and kills himself before he can harm Bakura. He gets better.
- Kudaragi (Scud) voiced by: Kendo Kobayashi (JP), Billy Bob Thompson (EN)
A youth gang in Domino High led by Kudaragi/Scud, this group only appears in Yu-Gi-Oh! The Dark Side of Dimensions. Kudaragi films his victims and uploads the beatings on the internet to make them "famous." The gang harasses Aigami and are sent to another dimension, never returning even after his defeat.
Kudaragi appears in Yu-Gi-Oh! Duel Links, running a beatdown/burn deck that causes damage to opponents and himself.
- Ascended Extra: For whatever reason, Kudaragi became a playable Duel Links character despite having screen time of only 5 minutes.
- Asshole Victim: These jerks paid the price for bullying Aigami.
- Bullying a Dragon: Harassing Aigami gets them sent to another dimension.
- Combat Sadomasochist: In Duel Links Kudaragi gets off on dealing pain to others and himself, best exemplified by the moan he makes when giving up Life Points.
- Depraved Homosexual: Heavily implied with Kudaragi in the subbed movie, as he comments on how cute Aigami looks and promises to make him smile for the camera when he's through with him.
- Dub Name Change: Kudaragi's name was changed to Scud in the movie dub.
Princess Mary (Princess Adena)
- Voiced by Eri Sendai (JP), Unknown (EN)
Princess Adena is the princess of Gouland (Sin Lau in the English dub), the kingdom in Kaiba Corporation's virtual reality Duel Monsters RPG. Her design was created by the Big Five (Seto Kaiba in the English dub), based off Seto Kaiba's little brother, Mokuba Kaiba. She volunteered as a sacrifice to the Mythic Dragon to keep her kingdom safe. The princess is actually the Mystical Elf, who can revive fallen characters with her magic.
- Composite Character: She's a female version of Mokuba as well as the Mystical Elf.
- Crossdressing: When she switches clothes with Mokuba.
- Damsel in Distress: She was meant to be this, but Mokuba takes her place.
- Expy: Her design is heavily based off of Mokuba Kaiba, with only a different eye color, gender, and slightly lighter skin tone differentiating them.
- Healing Hands: Since she's actually the Mystical Elf, she has the ability to revive the fallen party members.
- Human Sacrifice: She volunteered herself as a sacrifice to the Mythic Dragon to keep her kingdom safe.
- Lonely Rich Kid: Her nursemaid mentions that she didn't have many friends growing up.
- Non-Player Character: She's one of the many NPCs populating the game.
- Princess Classic: She's sweet, courteous, and kind, but isn't much good in a fight.
- Voiced by Eiji Takemoto (JP), Darren Dunstan (EN)
The Witty Phantom is a character based on the "Witty Phantom" card. In the Duel Monsters Quest game he presides over all of the enemy Duel Monsters and is in charge of the sacrifices to summon the Five-Headed Dragon. In the dub, his voice and mannerisms are based off of Pegasus.
- Big Bad: In the virtual game, he's in charge of all the enemies in the game. In the story arc this role is taken by the Big Five.
- Expy: In the dub, his voice and mannerisms are based off of Pegasus.
- I Shall Taunt You: He spends most of his time taunting the captive Kaiba while waiting for Mokuba to be captured as well.
- Non-Action Big Bad: He has only 1400 ATK and 1300 DEF, which some of the random monsters exceed, so when Kaiba brings out his Blue-Eyes White Dragon the results are what you'd expect.